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3(135-x)=x-15
We move all terms to the left:
3(135-x)-(x-15)=0
We add all the numbers together, and all the variables
3(-1x+135)-(x-15)=0
We multiply parentheses
-3x-(x-15)+405=0
We get rid of parentheses
-3x-x+15+405=0
We add all the numbers together, and all the variables
-4x+420=0
We move all terms containing x to the left, all other terms to the right
-4x=-420
x=-420/-4
x=+105
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