-15+x+x=135

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Solution for -15+x+x=135 equation: 



-15+x+x=135

We move all terms to the left:

-15+x+x-(135)=0

We add all the numbers together, and all the variables

2x-150=0

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

2x=150

x=150/2

x=75

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