-6a-9=31-a

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Solution for -6a-9=31-a equation: 


a in (-oo:+oo)

-6*a-9 = 31-a // - 31-a

a-6*a-31-9 = 0

-5*a-40 = 0 // + 40

-5*a = 40 // : -5

a = 40/(-5)

a = -8

a = -8

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