21/2=d/80

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Solution for 21/2=d/80 equation: 


d in (-oo:+oo)

21/2 = d/80 // - d/80

21/2-(d/80) = 0

21/2-1/80*d = 0 // - 21/2

-1/80*d = -21/2 // : -1/80

d = -21/2/(-1/80)

d = 840

d = 840

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