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12x+18=10x-20
We move all terms to the left:
12x+18-(10x-20)=0
We get rid of parentheses
12x-10x+20+18=0
We add all the numbers together, and all the variables
2x+38=0
We move all terms containing x to the left, all other terms to the right
2x=-38
x=-38/2
x=-19
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