30=2d/7

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Solution for 30=2d/7 equation: 


d in (-oo:+oo)

30 = (2*d)/7 // - (2*d)/7

30-((2*d)/7) = 0

(-2/7)*d+30 = 0

30-2/7*d = 0 // - 30

-2/7*d = -30 // : -2/7

d = -30/(-2/7)

d = 105

d = 105

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