-3a-3=-21

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


a in (-oo:+oo)

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

21-3*a-3 = 0

18-3*a = 0 // - 18

-3*a = -18 // : -3

a = -18/(-3)

a = 6

a = 6

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