21+4a=7(3-7a)

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Solution for 21+4a=7(3-7a) equation: 



21+4a=7(3-7a)

We move all terms to the left:

21+4a-(7(3-7a))=0

We add all the numbers together, and all the variables

4a-(7(-7a+3))+21=0



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

7(-7a+3)

We multiply parentheses

-49a+21

Back to the equation:

-(-49a+21)



We get rid of parentheses

4a+49a-21+21=0

We add all the numbers together, and all the variables

53a=0

a=0/53

a=0

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