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![](https://rs.olm.vn/images/avt/0.png?1311)
47 – x + 15 = 21 47 – x − 15 = 21 47 − x = 21 + 15 7 − x = 36 − x = 47 − 36 − x = 11 x = − 11.
![](https://rs.olm.vn/images/avt/0.png?1311)
11 + 15 – x = 1 15 − x = 1 − 11 15 − x = − 10 15 + 10 = x x = 25.
![](https://rs.olm.vn/images/avt/0.png?1311)
– 5 – 24 – x = – 11 − 5 − 24 + x = − 11 − 29 + x = − 11 x = − 11 + 29 x = 18.
![](https://rs.olm.vn/images/avt/0.png?1311)
a; 47 - ( x + 15) = 21
x + 15 = 47 - 21
x + 15 = 26
x = 26 - 15
x = 11
b, (-5) - ( 24 -x) = - 11
24 -x = ( - 5) - ( - 11 )
24 -x = 6
x = 24 - 6
x = 18
a; 47 - ( x + 15) = 21
x + 15 = 47 - 21
x + 15 = 26
x = 26 - 15
x = 11
b, (-5) - ( 24 -x) = - 11
24 -x = ( - 5) - ( - 11 )
24 -x = 6
x = 24 - 6
x = 18
![](https://rs.olm.vn/images/avt/0.png?1311)
c) \(47-\left(x-15\right)=21\)
\(\Leftrightarrow x-15=47-21\)
\(\Leftrightarrow x-15=26\)
\(\Leftrightarrow x=26+15=41\)
d) \(-5-\left(24-x\right)=-11\)
\(\Leftrightarrow24-x=-5+11\)
\(\Leftrightarrow24-x=6\)
\(\Leftrightarrow x=24-6=18\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 2
a,17-(2+x)=3
(2+x)=17-3
(2+x)=14
x=14-2
x=12
b,Bạn ghi ^ là thế nào
a) 47 – x + 15 = 21 ⇔ 47 – x − 15 = 21 ⇔ 47 − x = 21 + 15 ⇔ 7 − x = 36 ⇔ − x = 47 − 36 ⇔ − x = 11 ⇔ x = − 11.
b) – 5 – 24 – x = – 11 ⇔ − 5 − 24 + x = − 11 ⇔ − 29 + x = − 11 ⇔ x = − 11 + 29 ⇔ x = 18.
c) 11 + 15 – x = 1 ⇔ 15 − x = 1 − 11 ⇔ 15 − x = − 10 ⇔ 15 + 10 = x ⇔ x = 25.