21=7(10+y)

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Solution for 21=7(10+y) equation: 



21=7(10+y)

We move all terms to the left:

21-(7(10+y))=0

We add all the numbers together, and all the variables

-(7(y+10))+21=0



We calculate terms in parentheses: -(7(y+10)), so:

7(y+10)

We multiply parentheses

7y+70

Back to the equation:

-(7y+70)



We get rid of parentheses

-7y-70+21=0

We add all the numbers together, and all the variables

-7y-49=0

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

-7y=49

y=49/-7

y=-7

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