21=2(y+7)-7y

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Solution for 21=2(y+7)-7y equation: 



21=2(y+7)-7y

We move all terms to the left:

21-(2(y+7)-7y)=0



We calculate terms in parentheses: -(2(y+7)-7y), so:

2(y+7)-7y

We add all the numbers together, and all the variables

-7y+2(y+7)

We multiply parentheses

-7y+2y+14

We add all the numbers together, and all the variables

-5y+14

Back to the equation:

-(-5y+14)



We get rid of parentheses

5y-14+21=0

We add all the numbers together, and all the variables

5y+7=0

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

5y=-7

y=-7/5

y=-1+2/5

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