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x-215=-11x+85
We move all terms to the left:
x-215-(-11x+85)=0
We get rid of parentheses
x+11x-85-215=0
We add all the numbers together, and all the variables
12x-300=0
We move all terms containing x to the left, all other terms to the right
12x=300
x=300/12
x=25
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