-15=a(-5)

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Solution for -15=a(-5) equation: 



-15=a(-5)

We move all terms to the left:

-15-(a(-5))=0



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

a(-5)

We multiply parentheses

-5a

Back to the equation:

-(-5a)



We get rid of parentheses

5a-15=0

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

5a=15

a=15/5

a=3

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