2x+15=120-x

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Solution for 2x+15=120-x equation: 



2x+15=120-x

We move all terms to the left:

2x+15-(120-x)=0

We add all the numbers together, and all the variables

2x-(-1x+120)+15=0

We get rid of parentheses

2x+1x-120+15=0

We add all the numbers together, and all the variables

3x-105=0

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

3x=105

x=105/3

x=35

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