-6a-9=21

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Solution for -6a-9=21 equation: 


a in (-oo:+oo)

-6*a-9 = 21 // - 21

-6*a-21-9 = 0

-6*a-30 = 0 // + 30

-6*a = 30 // : -6

a = 30/(-6)

a = -5

a = -5

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