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-258-2x=-20x+12
We move all terms to the left:
-258-2x-(-20x+12)=0
We get rid of parentheses
-2x+20x-12-258=0
We add all the numbers together, and all the variables
18x-270=0
We move all terms containing x to the left, all other terms to the right
18x=270
x=270/18
x=15
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