4=z/7

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Solution for 4=z/7 equation: 


z in (-oo:+oo)

4 = z/7 // - z/7

4-(z/7) = 0

4-1/7*z = 0 // - 4

-1/7*z = -4 // : -1/7

z = -4/(-1/7)

z = 28

z = 28

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