91=4(5+3a)-1

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Solution for 91=4(5+3a)-1 equation: 



91=4(5+3a)-1

We move all terms to the left:

91-(4(5+3a)-1)=0

We add all the numbers together, and all the variables

-(4(3a+5)-1)+91=0



We calculate terms in parentheses: -(4(3a+5)-1), so:

4(3a+5)-1

We multiply parentheses

12a+20-1

We add all the numbers together, and all the variables

12a+19

Back to the equation:

-(12a+19)



We get rid of parentheses

-12a-19+91=0

We add all the numbers together, and all the variables

-12a+72=0

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

-12a=-72

a=-72/-12

a=+6

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