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5x-10=6x-21
We move all terms to the left:
5x-10-(6x-21)=0
We get rid of parentheses
5x-6x+21-10=0
We add all the numbers together, and all the variables
-1x+11=0
We move all terms containing x to the left, all other terms to the right
-x=-11
x=-11/-1
x=+11
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