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z in (-oo:+oo)
(7*z)/2 = 9-(3*z) // - 9-(3*z)
(7*z)/2+3*z-9 = 0
13/2*z-9 = 0 // + 9
13/2*z = 9 // : 13/2
z = 9/13/2
z = 18/13
z = 18/13
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