-3a+9=-21

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Solution for -3a+9=-21 equation: 


a in (-oo:+oo)

9-3*a = -21 // + 21

9-3*a+21 = 0

30-3*a = 0 // - 30

-3*a = -30 // : -3

a = -30/(-3)

a = 10

a = 10

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