21x=4(5x-7)

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Solution for 21x=4(5x-7) equation: 



21x=4(5x-7)

We move all terms to the left:

21x-(4(5x-7))=0



We calculate terms in parentheses: -(4(5x-7)), so:

4(5x-7)

We multiply parentheses

20x-28

Back to the equation:

-(20x-28)



We get rid of parentheses

21x-20x+28=0

We add all the numbers together, and all the variables

x+28=0

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

x=-28

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