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20-9x=-20+2x
We move all terms to the left:
20-9x-(-20+2x)=0
We add all the numbers together, and all the variables
-9x-(2x-20)+20=0
We get rid of parentheses
-9x-2x+20+20=0
We add all the numbers together, and all the variables
-11x+40=0
We move all terms containing x to the left, all other terms to the right
-11x=-40
x=-40/-11
x=3+7/11
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