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10x+12=-3x
We move all terms to the left:
10x+12-(-3x)=0
We get rid of parentheses
10x+3x+12=0
We add all the numbers together, and all the variables
13x+12=0
We move all terms containing x to the left, all other terms to the right
13x=-12
x=-12/13
x=-12/13
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