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 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-120=0

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

16x=120

x=120/16

x=7+1/2

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