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81-(4x/7)=21
We move all terms to the left:
81-(4x/7)-(21)=0
We add all the numbers together, and all the variables
-(+4x/7)+81-21=0
We add all the numbers together, and all the variables
-(+4x/7)+60=0
We get rid of parentheses
-4x/7+60=0
We multiply all the terms by the denominator
-4x+60*7=0
We add all the numbers together, and all the variables
-4x+420=0
We move all terms containing x to the left, all other terms to the right
-4x=-420
x=-420/-4
x=+105
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