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7x+7=12x+2
We move all terms to the left:
7x+7-(12x+2)=0
We get rid of parentheses
7x-12x-2+7=0
We add all the numbers together, and all the variables
-5x+5=0
We move all terms containing x to the left, all other terms to the right
-5x=-5
x=-5/-5
x=1
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