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10x+8=11x-21
We move all terms to the left:
10x+8-(11x-21)=0
We get rid of parentheses
10x-11x+21+8=0
We add all the numbers together, and all the variables
-1x+29=0
We move all terms containing x to the left, all other terms to the right
-x=-29
x=-29/-1
x=+29
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