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11x-3x+102=11x+39
We move all terms to the left:
11x-3x+102-(11x+39)=0
We add all the numbers together, and all the variables
8x-(11x+39)+102=0
We get rid of parentheses
8x-11x-39+102=0
We add all the numbers together, and all the variables
-3x+63=0
We move all terms containing x to the left, all other terms to the right
-3x=-63
x=-63/-3
x=+21
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