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-81+4x=-3x+108
We move all terms to the left:
-81+4x-(-3x+108)=0
We get rid of parentheses
4x+3x-108-81=0
We add all the numbers together, and all the variables
7x-189=0
We move all terms containing x to the left, all other terms to the right
7x=189
x=189/7
x=27
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