2/5=z/20

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Solution for 2/5=z/20 equation: 


z in (-oo:+oo)

2/5 = z/20 // - z/20

2/5-(z/20) = 0

2/5-1/20*z = 0 // - 2/5

-1/20*z = -2/5 // : -1/20

z = -2/5/(-1/20)

z = 8

z = 8

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