-21=3(3x+5)

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Solution for -21=3(3x+5) equation: 



-21=3(3x+5)

We move all terms to the left:

-21-(3(3x+5))=0



We calculate terms in parentheses: -(3(3x+5)), so:

3(3x+5)

We multiply parentheses

9x+15

Back to the equation:

-(9x+15)



We get rid of parentheses

-9x-15-21=0

We add all the numbers together, and all the variables

-9x-36=0

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

-9x=36

x=36/-9

x=-4

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