--12(x+3)=4(x-21)

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Solution for --12(x+3)=4(x-21) equation: 



--12(x+3)=4(x-21)

We move all terms to the left:

--12(x+3)-(4(x-21))=0

We add all the numbers together, and all the variables

-12(x+3)-(4(x-21))=0

We multiply parentheses

-12x-(4(x-21))-36=0



We calculate terms in parentheses: -(4(x-21)), so:

4(x-21)

We multiply parentheses

4x-84

Back to the equation:

-(4x-84)



We get rid of parentheses

-12x-4x+84-36=0

We add all the numbers together, and all the variables

-16x+48=0

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

-16x=-48

x=-48/-16

x=+3

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