2a+15+2a=-4a-21

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Solution for 2a+15+2a=-4a-21 equation: 



2a+15+2a=-4a-21

We move all terms to the left:

2a+15+2a-(-4a-21)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

4a+4a+21+15=0

We add all the numbers together, and all the variables

8a+36=0

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

8a=-36

a=-36/8

a=-4+1/2

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