91=7(3a-1)

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Solution for 91=7(3a-1) equation: 



91=7(3a-1)

We move all terms to the left:

91-(7(3a-1))=0



We calculate terms in parentheses: -(7(3a-1)), so:

7(3a-1)

We multiply parentheses

21a-7

Back to the equation:

-(21a-7)



We get rid of parentheses

-21a+7+91=0

We add all the numbers together, and all the variables

-21a+98=0

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

-21a=-98

a=-98/-21

a=4+2/3

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