-3(a+5)=-21-2a

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Solution for -3(a+5)=-21-2a equation: 



-3(a+5)=-21-2a

We move all terms to the left:

-3(a+5)-(-21-2a)=0

We add all the numbers together, and all the variables

-3(a+5)-(-2a-21)=0

We multiply parentheses

-3a-(-2a-21)-15=0

We get rid of parentheses

-3a+2a+21-15=0

We add all the numbers together, and all the variables

-1a+6=0

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

-a=-6

a=-6/-1

a=+6

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