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10x+7=12x+20
We move all terms to the left:
10x+7-(12x+20)=0
We get rid of parentheses
10x-12x-20+7=0
We add all the numbers together, and all the variables
-2x-13=0
We move all terms containing x to the left, all other terms to the right
-2x=13
x=13/-2
x=-6+1/2
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