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-12=7x-7
We move all terms to the left:
-12-(7x-7)=0
We get rid of parentheses
-7x+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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