-15=5(2+a)

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Solution for -15=5(2+a) equation: 



-15=5(2+a)

We move all terms to the left:

-15-(5(2+a))=0

We add all the numbers together, and all the variables

-(5(a+2))-15=0



We calculate terms in parentheses: -(5(a+2)), so:

5(a+2)

We multiply parentheses

5a+10

Back to the equation:

-(5a+10)



We get rid of parentheses

-5a-10-15=0

We add all the numbers together, and all the variables

-5a-25=0

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

-5a=25

a=25/-5

a=-5

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