3(-3d+9)=81

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Solution for 3(-3d+9)=81 equation: 


d in (-oo:+oo)

3*(9-3*d) = 81 // - 81

3*(9-3*d)-81 = 0

3*(9-3*d)-81 = 0

-9*d-54 = 0

-9*d-54 = 0

-9*d-54 = 0 // + 54

-9*d = 54 // : -9

d = 54/(-9)

d = -6

d = -6

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