20=z/4

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Solution for 20=z/4 equation: 


z in (-oo:+oo)

20 = z/4 // - z/4

20-(z/4) = 0

20-1/4*z = 0 // - 20

-1/4*z = -20 // : -1/4

z = -20/(-1/4)

z = 80

z = 80

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