9a+13a-15a-3a=-8

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Solution for 9a+13a-15a-3a=-8 equation: 



9a+13a-15a-3a=-8

We move all terms to the left:

9a+13a-15a-3a-(-8)=0

We add all the numbers together, and all the variables

4a+8=0

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

4a=-8

a=-8/4

a=-2

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