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9x-(5x+8)=5x-20
We move all terms to the left:
9x-(5x+8)-(5x-20)=0
We get rid of parentheses
9x-5x-5x-8+20=0
We add all the numbers together, and all the variables
-1x+12=0
We move all terms containing x to the left, all other terms to the right
-x=-12
x=-12/-1
x=+12
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