-(4a+15)=-21

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Solution for -(4a+15)=-21 equation: 



-(4a+15)=-21

We move all terms to the left:

-(4a+15)-(-21)=0

We add all the numbers together, and all the variables

-(4a+15)+21=0

We get rid of parentheses

-4a-15+21=0

We add all the numbers together, and all the variables

-4a+6=0

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

-4a=-6

a=-6/-4

a=1+1/2

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