13+4a=-15

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Solution for 13+4a=-15 equation: 



13+4a=-15

We move all terms to the left:

13+4a-(-15)=0

We add all the numbers together, and all the variables

4a+28=0

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

4a=-28

a=-28/4

a=-7

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