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(21x-5)+(10x+11)=50
We move all terms to the left:
(21x-5)+(10x+11)-(50)=0
We get rid of parentheses
21x+10x-5+11-50=0
We add all the numbers together, and all the variables
31x-44=0
We move all terms containing x to the left, all other terms to the right
31x=44
x=44/31
x=1+13/31
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