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83x+140=12x+2
We move all terms to the left:
83x+140-(12x+2)=0
We get rid of parentheses
83x-12x-2+140=0
We add all the numbers together, and all the variables
71x+138=0
We move all terms containing x to the left, all other terms to the right
71x=-138
x=-138/71
x=-1+67/71
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