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285=x+x-15+4+2x
We move all terms to the left:
285-(x+x-15+4+2x)=0
We add all the numbers together, and all the variables
-(4x-11)+285=0
We get rid of parentheses
-4x+11+285=0
We add all the numbers together, and all the variables
-4x+296=0
We move all terms containing x to the left, all other terms to the right
-4x=-296
x=-296/-4
x=+74
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