30=0.75(12a-20)

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Solution for 30=0.75(12a-20) equation: 



30=0.75(12a-20)

We move all terms to the left:

30-(0.75(12a-20))=0



We calculate terms in parentheses: -(0.75(12a-20)), so:

0.75(12a-20)

We multiply parentheses

9a-15

Back to the equation:

-(9a-15)



We get rid of parentheses

-9a+15+30=0

We add all the numbers together, and all the variables

-9a+45=0

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

-9a=-45

a=-45/-9

a=+5

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