21=y/2

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Solution for 21=y/2 equation: 



21=y/2

We move all terms to the left:

21-(y/2)=0

We add all the numbers together, and all the variables

-(+y/2)+21=0

We get rid of parentheses

-y/2+21=0

We multiply all the terms by the denominator


-y+21*2=0

We add all the numbers together, and all the variables

-1y+42=0

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

-y=-42

y=-42/-1

y=+42

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