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