3-3a=-21

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Solution for 3-3a=-21 equation: 


a in (-oo:+oo)

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

3-(3*a)+21 = 0

3-3*a+21 = 0

24-3*a = 0 // - 24

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

a = -24/(-3)

a = 8

a = 8

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