3(-3+d)=21

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Solution for 3(-3+d)=21 equation: 


d in (-oo:+oo)

3*(d-3) = 21 // - 21

3*(d-3)-21 = 0

3*(d-3)-21 = 0

3*d-30 = 0

3*d-30 = 0

3*d-30 = 0 // + 30

3*d = 30 // : 3

d = 30/3

d = 10

d = 10

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