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9x=9-20+8x
We move all terms to the left:
9x-(9-20+8x)=0
We add all the numbers together, and all the variables
9x-(8x-11)=0
We get rid of parentheses
9x-8x+11=0
We add all the numbers together, and all the variables
x+11=0
We move all terms containing x to the left, all other terms to the right
x=-11
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