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12-(3x+7)+10x=0
We add all the numbers together, and all the variables
10x-(3x+7)+12=0
We get rid of parentheses
10x-3x-7+12=0
We add all the numbers together, and all the variables
7x+5=0
We move all terms containing x to the left, all other terms to the right
7x=-5
x=-5/7
x=-5/7
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