90=6(1-7a)

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Solution for 90=6(1-7a) equation: 



90=6(1-7a)

We move all terms to the left:

90-(6(1-7a))=0

We add all the numbers together, and all the variables

-(6(-7a+1))+90=0



We calculate terms in parentheses: -(6(-7a+1)), so:

6(-7a+1)

We multiply parentheses

-42a+6

Back to the equation:

-(-42a+6)



We get rid of parentheses

42a-6+90=0

We add all the numbers together, and all the variables

42a+84=0

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

42a=-84

a=-84/42

a=-2

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