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21=x1/4
We move all terms to the left:
21-(x1/4)=0
We add all the numbers together, and all the variables
-(+x1/4)+21=0
We get rid of parentheses
-x1/4+21=0
We multiply all the terms by the denominator
-x1+21*4=0
We add all the numbers together, and all the variables
-1x+84=0
We move all terms containing x to the left, all other terms to the right
-x=-84
x=-84/-1
x=+84
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