7x-21=7(-6x-3)

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Solution for 7x-21=7(-6x-3) equation: 



7x-21=7(-6x-3)

We move all terms to the left:

7x-21-(7(-6x-3))=0



We calculate terms in parentheses: -(7(-6x-3)), so:

7(-6x-3)

We multiply parentheses

-42x-21

Back to the equation:

-(-42x-21)



We get rid of parentheses

7x+42x+21-21=0

We add all the numbers together, and all the variables

49x=0

x=0/49

x=0

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