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-125+12x=3x+100
We move all terms to the left:
-125+12x-(3x+100)=0
We get rid of parentheses
12x-3x-100-125=0
We add all the numbers together, and all the variables
9x-225=0
We move all terms containing x to the left, all other terms to the right
9x=225
x=225/9
x=25
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