21=17+y/2

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Solution for 21=17+y/2 equation: 



21=17+y/2

We move all terms to the left:

21-(17+y/2)=0

We add all the numbers together, and all the variables

-(y/2+17)+21=0

We get rid of parentheses

-y/2-17+21=0

We multiply all the terms by the denominator


-y-17*2+21*2=0

We add all the numbers together, and all the variables

-1y+8=0

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

-y=-8

y=-8/-1

y=+8

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