15+2x=90-x

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Solution for 15+2x=90-x equation: 



15+2x=90-x

We move all terms to the left:

15+2x-(90-x)=0

We add all the numbers together, and all the variables

2x-(-1x+90)+15=0

We get rid of parentheses

2x+1x-90+15=0

We add all the numbers together, and all the variables

3x-75=0

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

3x=75

x=75/3

x=25

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