z/9-z/21=1/9

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Solution for z/9-z/21=1/9 equation: 


z in (-oo:+oo)

z/9-(z/21) = 1/9 // - 1/9

z/9-(z/21)-(1/9) = 0

z/9-(z/21)-1/9 = 0

4/63*z-1/9 = 0 // + 1/9

4/63*z = 1/9 // : 4/63

z = 1/9/4/63

z = 7/4

z = 7/4

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