21=-y/4

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Solution for 21=-y/4 equation: 



21=-y/4

We move all terms to the left:

21-(-y/4)=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

y+84=0

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

y=-84

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