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15-1x=2x-66
We move all terms to the left:
15-1x-(2x-66)=0
We get rid of parentheses
-1x-2x+66+15=0
We add all the numbers together, and all the variables
-3x+81=0
We move all terms containing x to the left, all other terms to the right
-3x=-81
x=-81/-3
x=+27
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