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z in (-oo:+oo)
(3*z)/7-9 = -4 // + 4
(3*z)/7-9+4 = 0
3/7*z-5 = 0 // + 5
3/7*z = 5 // : 3/7
z = 5/3/7
z = 35/3
z = 35/3
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