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12x+43=4x+83
We move all terms to the left:
12x+43-(4x+83)=0
We get rid of parentheses
12x-4x-83+43=0
We add all the numbers together, and all the variables
8x-40=0
We move all terms containing x to the left, all other terms to the right
8x=40
x=40/8
x=5
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