1/5-7/4=z/20

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Solution for 1/5-7/4=z/20 equation: 


z in (-oo:+oo)

1/5-(7/4) = z/20 // - z/20

1/5-(z/20)-(7/4) = 0

1/5-(z/20)-7/4 = 0

-1/20*z-31/20 = 0 // + 31/20

-1/20*z = 31/20 // : -1/20

z = 31/20/(-1/20)

z = -31

z = -31

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