4z/7-1=9

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Solution for 4z/7-1=9 equation: 


z in (-oo:+oo)

(4*z)/7-1 = 9 // - 9

(4*z)/7-9-1 = 0

4/7*z-10 = 0 // + 10

4/7*z = 10 // : 4/7

z = 10/4/7

z = 35/2

z = 35/2

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