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77-2x=89-3x
We move all terms to the left:
77-2x-(89-3x)=0
We add all the numbers together, and all the variables
-2x-(-3x+89)+77=0
We get rid of parentheses
-2x+3x-89+77=0
We add all the numbers together, and all the variables
x-12=0
We move all terms containing x to the left, all other terms to the right
x=12
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