21=y/4=12

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Solution for 21=y/4=12 equation: 



21=y/4=12

We move all terms to the left:

21-(y/4)=0

We add all the numbers together, and all the variables

-(+y/4)+21=0

We get rid of parentheses

-y/4+21=0

We multiply all the terms by the denominator


-y+21*4=0

We add all the numbers together, and all the variables

-1y+84=0

We move all terms containing y to the left, all other terms to the right

-y=-84

y=-84/-1

y=+84

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