-3a+9=-15

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


a in (-oo:+oo)

9-3*a = -15 // + 15

9-3*a+15 = 0

24-3*a = 0 // - 24

-3*a = -24 // : -3

a = -24/(-3)

a = 8

a = 8

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