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10x+20=12x-40
We move all terms to the left:
10x+20-(12x-40)=0
We get rid of parentheses
10x-12x+40+20=0
We add all the numbers together, and all the variables
-2x+60=0
We move all terms containing x to the left, all other terms to the right
-2x=-60
x=-60/-2
x=+30
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