-100=-5(5+3a)

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Solution for -100=-5(5+3a) equation: 



-100=-5(5+3a)

We move all terms to the left:

-100-(-5(5+3a))=0

We add all the numbers together, and all the variables

-(-5(3a+5))-100=0



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

-5(3a+5)

We multiply parentheses

-15a-25

Back to the equation:

-(-15a-25)



We get rid of parentheses

15a+25-100=0

We add all the numbers together, and all the variables

15a-75=0

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

15a=75

a=75/15

a=5

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