-7(7a+3)=5a-21

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Solution for -7(7a+3)=5a-21 equation: 



-7(7a+3)=5a-21

We move all terms to the left:

-7(7a+3)-(5a-21)=0

We multiply parentheses

-49a-(5a-21)-21=0

We get rid of parentheses

-49a-5a+21-21=0

We add all the numbers together, and all the variables

-54a=0

a=0/-54

a=0

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