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135=15x+15
We move all terms to the left:
135-(15x+15)=0
We get rid of parentheses
-15x-15+135=0
We add all the numbers together, and all the variables
-15x+120=0
We move all terms containing x to the left, all other terms to the right
-15x=-120
x=-120/-15
x=+8
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