-90=5(2a-4)

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Solution for -90=5(2a-4) equation: 



-90=5(2a-4)

We move all terms to the left:

-90-(5(2a-4))=0



We calculate terms in parentheses: -(5(2a-4)), so:

5(2a-4)

We multiply parentheses

10a-20

Back to the equation:

-(10a-20)



We get rid of parentheses

-10a+20-90=0

We add all the numbers together, and all the variables

-10a-70=0

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

-10a=70

a=70/-10

a=-7

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