5(6a-9)=21

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Solution for 5(6a-9)=21 equation: 



5(6a-9)=21

We move all terms to the left:

5(6a-9)-(21)=0

We multiply parentheses

30a-45-21=0

We add all the numbers together, and all the variables

30a-66=0

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

30a=66

a=66/30

a=2+1/5

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