-5(6a+21)=-15

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Solution for -5(6a+21)=-15 equation: 



-5(6a+21)=-15

We move all terms to the left:

-5(6a+21)-(-15)=0

We add all the numbers together, and all the variables

-5(6a+21)+15=0

We multiply parentheses

-30a-105+15=0

We add all the numbers together, and all the variables

-30a-90=0

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

-30a=90

a=90/-30

a=-3

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