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z in (-oo:+oo)
(4*z)/7-2 = -5 // + 5
(4*z)/7-2+5 = 0
4/7*z+3 = 0 // - 3
4/7*z = -3 // : 4/7
z = -3/4/7
z = -21/4
z = -21/4
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