21x-28=7(3x-4)

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Solution for 21x-28=7(3x-4) equation: 



21x-28=7(3x-4)

We move all terms to the left:

21x-28-(7(3x-4))=0



We calculate terms in parentheses: -(7(3x-4)), so:

7(3x-4)

We multiply parentheses

21x-28

Back to the equation:

-(21x-28)



We get rid of parentheses

21x-21x+28-28=0

We add all the numbers together, and all the variables

=0

x=0/1

x=0

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