-3(a+13)=-15

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Solution for -3(a+13)=-15 equation: 



-3(a+13)=-15

We move all terms to the left:

-3(a+13)-(-15)=0

We add all the numbers together, and all the variables

-3(a+13)+15=0

We multiply parentheses

-3a-39+15=0

We add all the numbers together, and all the variables

-3a-24=0

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

-3a=24

a=24/-3

a=-8

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