9x+45=-x+135

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Solution for 9x+45=-x+135 equation: 



9x+45=-x+135

We move all terms to the left:

9x+45-(-x+135)=0

We add all the numbers together, and all the variables

9x-(-1x+135)+45=0

We get rid of parentheses

9x+1x-135+45=0

We add all the numbers together, and all the variables

10x-90=0

We move all terms containing x to the left, all other terms to the right

10x=90

x=90/10

x=9

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