21=-3(x+5)+12x

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Solution for 21=-3(x+5)+12x equation: 



21=-3(x+5)+12x

We move all terms to the left:

21-(-3(x+5)+12x)=0



We calculate terms in parentheses: -(-3(x+5)+12x), so:

-3(x+5)+12x

We add all the numbers together, and all the variables

12x-3(x+5)

We multiply parentheses

12x-3x-15

We add all the numbers together, and all the variables

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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