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<=>6x+3(10-x)=45
<=>6x+30-3x=45
<=>3x+30=45
<=>3x=15
<=>x=15:3
<=>x=5
Vậy x=5
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
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5x+3(10-x)+x=45
5x+x+3(10-x)=45
6x+3(10-x)=45
phân phối:
6x+3.10-3x=45
6x+30-3x=45
6x-3x+30=45
3x+30=45
3x=45-30
3x=15
x=15/3
Vậy x=5
![](https://rs.olm.vn/images/avt/0.png?1311)
5x + 3( 10- x ) + x = 45
\(\Rightarrow5x+30-3x+x=45\)
\(\Rightarrow3x+30=45\)
\(\Rightarrow3x=15\)
\(\Rightarrow x=5\)
5x+3(10-x)+x=45
5x+30x+x=45
5x-3x+x= 45-30
x(5-3+1)=15
x=15:3
x=5
Vậy x =5
![](https://rs.olm.vn/images/avt/0.png?1311)
1) 3x = 45 + 15 = 60
x = 60 : 3 = 20
2) 5x = 50 - 35 = 15
x = 15 : 5 = 3
3) (2x - 5) + 17 = 6
2x - 5 = 6 - 17
2x - 5 = -11
2x = -11 + 5
2x = -6
x = -6 : 2 = -3
4) 10 - 2(4 -3x) = -4
2(4 - 3x) = -4 - 10 = -14
4 - 3x = -14 : 2 = -7
3x = -7 - 4 = -18
x = -18 : 3 = -6
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left\{{}\begin{matrix}\left\{{}\begin{matrix}3x-15=45\Leftrightarrow3x=60\Leftrightarrow x=20\\35-5x=50\Leftrightarrow5x=-15\Leftrightarrow x=-3\end{matrix}\right.\\\left\{{}\begin{matrix}\left(2x-5\right)+17=6\Leftrightarrow2x+5=-11\Leftrightarrow2x=-16\Leftrightarrow x=-8\\10-2\left(4-3x\right)=-4\Leftrightarrow8-6x=14\Leftrightarrow6x=-6\Leftrightarrow x=-1\end{matrix}\right.\\\left\{{}\begin{matrix}-12+3\left(-x+7\right)=-18\Leftrightarrow-3x+21=-6\Leftrightarrow-3x=-27\Leftrightarrow x=9\\24:\left(3x-2\right)=-3\Leftrightarrow3x-2=-8\Leftrightarrow3x=-6\Leftrightarrow x=-2\end{matrix}\right.\\-45:5\left(-3-2x\right)=3\Leftrightarrow-15-10x=-15\Leftrightarrow10x=0\Leftrightarrow x=0\end{matrix}\right.\)
5x+3(10-x)+x=45
<=> 5x+30-3x+x=45
<=>3x+30=45
<=>3x=15
<=>x=5
5x+3(10-x)+x=45
6x+3(10-x)=45
2x+10-x=15
x+10=15
x=15-10
x=5