1/3d=-4/21

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Solution for 1/3d=-4/21 equation: 


d in (-oo:+oo)

(1/3)*d = -4/21 // + -4/21

(1/3)*d-(-4/21) = 0

(1/3)*d+4/21 = 0

1/3*d+4/21 = 0 // - 4/21

1/3*d = -4/21 // : 1/3

d = -4/21/1/3

d = -4/7

d = -4/7

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