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6x+12=3x-25
We move all terms to the left:
6x+12-(3x-25)=0
We get rid of parentheses
6x-3x+25+12=0
We add all the numbers together, and all the variables
3x+37=0
We move all terms containing x to the left, all other terms to the right
3x=-37
x=-37/3
x=-12+1/3
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