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-11+7x=20+8x
We move all terms to the left:
-11+7x-(20+8x)=0
We add all the numbers together, and all the variables
7x-(8x+20)-11=0
We get rid of parentheses
7x-8x-20-11=0
We add all the numbers together, and all the variables
-1x-31=0
We move all terms containing x to the left, all other terms to the right
-x=31
x=31/-1
x=-31
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