90=5(6-4a)

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Solution for 90=5(6-4a) equation: 



90=5(6-4a)

We move all terms to the left:

90-(5(6-4a))=0

We add all the numbers together, and all the variables

-(5(-4a+6))+90=0



We calculate terms in parentheses: -(5(-4a+6)), so:

5(-4a+6)

We multiply parentheses

-20a+30

Back to the equation:

-(-20a+30)



We get rid of parentheses

20a-30+90=0

We add all the numbers together, and all the variables

20a+60=0

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

20a=-60

a=-60/20

a=-3

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