80/640=x/20

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Solution for 80/640=x/20 equation: 


x in (-oo:+oo)

80/640 = x/20 // - x/20

80/640-(x/20) = 0

1/8-1/20*x = 0 // - 1/8

-1/20*x = -1/8 // : -1/20

x = -1/8/(-1/20)

x = 5/2

x = 5/2

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