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

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



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

We move all terms to the left:

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



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

-5x+3(x+3)

We multiply parentheses

-5x+3x+9

We add all the numbers together, and all the variables

-2x+9

Back to the equation:

-(-2x+9)



We get rid of parentheses

2x-9+21=0

We add all the numbers together, and all the variables

2x+12=0

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

2x=-12

x=-12/2

x=-6

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