91=-7(3a+10)

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Solution for 91=-7(3a+10) equation: 



91=-7(3a+10)

We move all terms to the left:

91-(-7(3a+10))=0



We calculate terms in parentheses: -(-7(3a+10)), so:

-7(3a+10)

We multiply parentheses

-21a-70

Back to the equation:

-(-21a-70)



We get rid of parentheses

21a+70+91=0

We add all the numbers together, and all the variables

21a+161=0

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

21a=-161

a=-161/21

a=-7+2/3

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