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![](https://rs.olm.vn/images/avt/0.png?1311)
\(\Rightarrow x+\frac{x}{7}=\frac{16}{35}\)
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x/7 = (x + 16)/35
(5 * x)/(5 * 7) = (x + 16)/35
(5 * x)/35 = (x + 16)/35
=> 5 * x - x = 16
4 * x = 16
x = 16 : 4
x = 4
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{x}{7}=\frac{x+16}{35}\)
\(\Leftrightarrow35x=7\left(x+16\right)\)
\(\Leftrightarrow35x=7x+112\)
\(\Leftrightarrow35x-7x=112\)
\(\Leftrightarrow28x=112\)
\(\Leftrightarrow x=4\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 35 - x = 16 - (-2) =>35 - x = 18 => x = 17
b) x - 2 = (-7) -9 => x - 2 = -16 => x = -14
![](https://rs.olm.vn/images/avt/0.png?1311)
a. (5.x + 3) : 4 – 16 = 6
(5.x + 3) : 4 = 22
(5.x + 3) = 88
5.x = 85
x = 13
b. 7(23 – 3.x) : 2 – 35 = 35
7(23 – 3.x) : 2 = 70
7(23 – 3.x) = 35
7 . 3.x = 12
7.x = 4
x = 4/7
a.) (5.x + 3) : 4 – 16 = 6
=> (5.x + 3) : 4 = 22
=> 5.x + 3 = 88
=> 5x = 85
=> x = 17
b) 7(23 – 3.x) : 2 – 35 = 35
=> 7(23 – 3.x) : 2 = 70
=>7(23 – 3.x) = 140
=> 23 – 3.x = 20
=> 3x = 3
=> x = 1
![](https://rs.olm.vn/images/avt/0.png?1311)
a: =>16/x=-4/5
hay x=-20
b: =>x+7/15=-2/3
=>x+7=-10
hay x=-17
Tìm số nguyên x, biết:
a) \(\dfrac{-28}{35}=\dfrac{16}{x};\) b) \(\dfrac{x+7}{15}=\dfrac{-24}{36}.\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a.\)
\(\dfrac{-28}{35}=\dfrac{16}{x}\)
\(\Rightarrow x=\dfrac{35\cdot16}{-28}=\dfrac{5\cdot7\cdot4\cdot4}{-7\cdot4}=-20\)
\(b.\)
\(\dfrac{x+7}{15}=\dfrac{-24}{36}\)
\(\Rightarrow x+7=\dfrac{15\cdot-24}{36}=\dfrac{5\cdot3\cdot-12\cdot2}{12\cdot3}=-10\)
\(\Leftrightarrow x=-17\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Trả lời
\(\frac{x}{7}=\frac{x-16}{35}\)
\(\Leftrightarrow35x=7.\left(x-16\right)\)
\(\Leftrightarrow35x=7x-112\)
\(\Leftrightarrow28x=-112\)
\(\Leftrightarrow x=-4\)
Vậy \(x=-4\)
\(\frac{x}{7}=\frac{x-16}{35}\)
\(\Leftrightarrow x.35=7.(x-6)\)
\(\Leftrightarrow35x=7x-112\)
\(\Leftrightarrow35x-7x=-112\)
\(\Leftrightarrow28x=-112\)
\(\Leftrightarrow x=-112\div28\)
\(\Leftrightarrow x=-4\)
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