13a-8a-14a+9a-15a=-15

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Solution for 13a-8a-14a+9a-15a=-15 equation: 



13a-8a-14a+9a-15a=-15

We move all terms to the left:

13a-8a-14a+9a-15a-(-15)=0

We add all the numbers together, and all the variables

-15a+15=0

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

-15a=-15

a=-15/-15

a=1

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