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21=x/4+8
We move all terms to the left:
21-(x/4+8)=0
We get rid of parentheses
-x/4-8+21=0
We multiply all the terms by the denominator
-x-8*4+21*4=0
We add all the numbers together, and all the variables
-1x+52=0
We move all terms containing x to the left, all other terms to the right
-x=-52
x=-52/-1
x=+52
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