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12x-45=28x+35
We move all terms to the left:
12x-45-(28x+35)=0
We get rid of parentheses
12x-28x-35-45=0
We add all the numbers together, and all the variables
-16x-80=0
We move all terms containing x to the left, all other terms to the right
-16x=80
x=80/-16
x=-5
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