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21=x/5+2
We move all terms to the left:
21-(x/5+2)=0
We get rid of parentheses
-x/5-2+21=0
We multiply all the terms by the denominator
-x-2*5+21*5=0
We add all the numbers together, and all the variables
-1x+95=0
We move all terms containing x to the left, all other terms to the right
-x=-95
x=-95/-1
x=+95
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