7(9+3a)=0

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Solution for 7(9+3a)=0 equation: 



7(9+3a)=0

We add all the numbers together, and all the variables

7(3a+9)=0

We multiply parentheses

21a+63=0

We move all terms containing a to the left, all other terms to the right

21a=-63

a=-63/21

a=-3

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