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100+11x=50+21x
We move all terms to the left:
100+11x-(50+21x)=0
We add all the numbers together, and all the variables
11x-(21x+50)+100=0
We get rid of parentheses
11x-21x-50+100=0
We add all the numbers together, and all the variables
-10x+50=0
We move all terms containing x to the left, all other terms to the right
-10x=-50
x=-50/-10
x=+5
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