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7x+12=5x-
We move all terms to the left:
7x+12-(5x-)=0
We add all the numbers together, and all the variables
7x-(+5x)+12=0
We get rid of parentheses
7x-5x+12=0
We add all the numbers together, and all the variables
2x+12=0
We move all terms containing x to the left, all other terms to the right
2x=-12
x=-12/2
x=-6
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