12=-a(-5)

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Solution for 12=-a(-5) equation: 



12=-a(-5)

We move all terms to the left:

12-(-a(-5))=0



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

-a(-5)

We multiply parentheses

5a

Back to the equation:

-(5a)



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

-5a=-12

a=-12/-5

a=2+2/5

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