91=7(7+2a)-8a

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Solution for 91=7(7+2a)-8a equation: 



91=7(7+2a)-8a

We move all terms to the left:

91-(7(7+2a)-8a)=0

We add all the numbers together, and all the variables

-(7(2a+7)-8a)+91=0



We calculate terms in parentheses: -(7(2a+7)-8a), so:

7(2a+7)-8a

We add all the numbers together, and all the variables

-8a+7(2a+7)

We multiply parentheses

-8a+14a+49

We add all the numbers together, and all the variables

6a+49

Back to the equation:

-(6a+49)



We get rid of parentheses

-6a-49+91=0

We add all the numbers together, and all the variables

-6a+42=0

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

-6a=-42

a=-42/-6

a=+7

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