4(21-y)+y=21

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Solution for 4(21-y)+y=21 equation: 



4(21-y)+y=21

We move all terms to the left:

4(21-y)+y-(21)=0

We add all the numbers together, and all the variables

4(-1y+21)+y-21=0

We add all the numbers together, and all the variables

y+4(-1y+21)-21=0

We multiply parentheses

y-4y+84-21=0

We add all the numbers together, and all the variables

-3y+63=0

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

-3y=-63

y=-63/-3

y=+21

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