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2x+21=11x-89
We move all terms to the left:
2x+21-(11x-89)=0
We get rid of parentheses
2x-11x+89+21=0
We add all the numbers together, and all the variables
-9x+110=0
We move all terms containing x to the left, all other terms to the right
-9x=-110
x=-110/-9
x=12+2/9
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