15a-5a=-20

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Solution for 15a-5a=-20 equation: 



15a-5a=-20

We move all terms to the left:

15a-5a-(-20)=0

We add all the numbers together, and all the variables

10a+20=0

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

10a=-20

a=-20/10

a=-2

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