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18x+20=12x-18
We move all terms to the left:
18x+20-(12x-18)=0
We get rid of parentheses
18x-12x+18+20=0
We add all the numbers together, and all the variables
6x+38=0
We move all terms containing x to the left, all other terms to the right
6x=-38
x=-38/6
x=-6+1/3
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