3a+15=-21

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Solution for 3a+15=-21 equation: 



3a+15=-21

We move all terms to the left:

3a+15-(-21)=0

We add all the numbers together, and all the variables

3a+36=0

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

3a=-36

a=-36/3

a=-12

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