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11+x/5=21
We move all terms to the left:
11+x/5-(21)=0
We add all the numbers together, and all the variables
x/5-10=0
We multiply all the terms by the denominator
x-10*5=0
We add all the numbers together, and all the variables
x-50=0
We move all terms containing x to the left, all other terms to the right
x=50
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