21=4(y+6)-7y

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Solution for 21=4(y+6)-7y equation: 



21=4(y+6)-7y

We move all terms to the left:

21-(4(y+6)-7y)=0



We calculate terms in parentheses: -(4(y+6)-7y), so:

4(y+6)-7y

We add all the numbers together, and all the variables

-7y+4(y+6)

We multiply parentheses

-7y+4y+24

We add all the numbers together, and all the variables

-3y+24

Back to the equation:

-(-3y+24)



We get rid of parentheses

3y-24+21=0

We add all the numbers together, and all the variables

3y-3=0

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

3y=3

y=3/3

y=1

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