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-7x-(-8x+20)=18
We move all terms to the left:
-7x-(-8x+20)-(18)=0
We get rid of parentheses
-7x+8x-20-18=0
We add all the numbers together, and all the variables
x-38=0
We move all terms containing x to the left, all other terms to the right
x=38
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