-4x=3(x-21)

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



-4x=3(x-21)

We move all terms to the left:

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



We calculate terms in parentheses: -(3(x-21)), so:

3(x-21)

We multiply parentheses

3x-63

Back to the equation:

-(3x-63)



We get rid of parentheses

-4x-3x+63=0

We add all the numbers together, and all the variables

-7x+63=0

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

-7x=-63

x=-63/-7

x=+9

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