d/40=84/80

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Solution for d/40=84/80 equation: 


d in (-oo:+oo)

d/40 = 84/80 // - 84/80

d/40-(84/80) = 0

d/40-21/20 = 0

1/40*d-21/20 = 0 // + 21/20

1/40*d = 21/20 // : 1/40

d = 21/20/1/40

d = 42

d = 42

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