9a+-3a+20a+-20a+-5a=-15

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Solution for 9a+-3a+20a+-20a+-5a=-15 equation: 



9a+-3a+20a+-20a+-5a=-15

We move all terms to the left:

9a+-3a+20a+-20a+-5a-(-15)=0

We add all the numbers together, and all the variables

a=0

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