3+2a=-15

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Solution for 3+2a=-15 equation: 



3+2a=-15

We move all terms to the left:

3+2a-(-15)=0

We add all the numbers together, and all the variables

2a+18=0

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

2a=-18

a=-18/2

a=-9

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