8+3a=-13

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Solution for 8+3a=-13 equation: 



8+3a=-13

We move all terms to the left:

8+3a-(-13)=0

We add all the numbers together, and all the variables

3a+21=0

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

3a=-21

a=-21/3

a=-7

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