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10x+20=12x-3
We move all terms to the left:
10x+20-(12x-3)=0
We get rid of parentheses
10x-12x+3+20=0
We add all the numbers together, and all the variables
-2x+23=0
We move all terms containing x to the left, all other terms to the right
-2x=-23
x=-23/-2
x=11+1/2
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