21-1y=87+2y

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Solution for 21-1y=87+2y equation: 



21-1y=87+2y

We move all terms to the left:

21-1y-(87+2y)=0

We add all the numbers together, and all the variables

-1y-(2y+87)+21=0

We get rid of parentheses

-1y-2y-87+21=0

We add all the numbers together, and all the variables

-3y-66=0

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

-3y=66

y=66/-3

y=-22

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