21y=-3(7y+3)-4

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Solution for 21y=-3(7y+3)-4 equation: 



21y=-3(7y+3)-4

We move all terms to the left:

21y-(-3(7y+3)-4)=0



We calculate terms in parentheses: -(-3(7y+3)-4), so:

-3(7y+3)-4

We multiply parentheses

-21y-9-4

We add all the numbers together, and all the variables

-21y-13

Back to the equation:

-(-21y-13)



We get rid of parentheses

21y+21y+13=0

We add all the numbers together, and all the variables

42y+13=0

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

42y=-13

y=-13/42

y=-13/42

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