3x=7(x-4)

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Solution for 3x=7(x-4) equation: 



3x=7(x-4)

We move all terms to the left:

3x-(7(x-4))=0



We calculate terms in parentheses: -(7(x-4)), so:

7(x-4)

We multiply parentheses

7x-28

Back to the equation:

-(7x-28)



We get rid of parentheses

3x-7x+28=0

We add all the numbers together, and all the variables

-4x+28=0

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

-4x=-28

x=-28/-4

x=+7

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