20a-9a+-8a=-15

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Solution for 20a-9a+-8a=-15 equation: 



20a-9a+-8a=-15

We move all terms to the left:

20a-9a+-8a-(-15)=0

We add all the numbers together, and all the variables

3a+15=0

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

3a=-15

a=-15/3

a=-5

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