3(30a-7)-18=21

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Solution for 3(30a-7)-18=21 equation: 



3(30a-7)-18=21

We move all terms to the left:

3(30a-7)-18-(21)=0

We add all the numbers together, and all the variables

3(30a-7)-39=0

We multiply parentheses

90a-21-39=0

We add all the numbers together, and all the variables

90a-60=0

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

90a=60

a=60/90

a=2/3

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