21-7x=7(7x+3)

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



21-7x=7(7x+3)

We move all terms to the left:

21-7x-(7(7x+3))=0



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

7(7x+3)

We multiply parentheses

49x+21

Back to the equation:

-(49x+21)



We get rid of parentheses

-7x-49x-21+21=0

We add all the numbers together, and all the variables

-56x=0

x=0/-56

x=0

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