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7=-7x-12
We move all terms to the left:
7-(-7x-12)=0
We get rid of parentheses
7x+12+7=0
We add all the numbers together, and all the variables
7x+19=0
We move all terms containing x to the left, all other terms to the right
7x=-19
x=-19/7
x=-2+5/7
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