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z in (-oo:+oo)
(3*z)/7-5 = -4 // + 4
(3*z)/7-5+4 = 0
3/7*z-1 = 0 // + 1
3/7*z = 1 // : 3/7
z = 1/3/7
z = 7/3
z = 7/3
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