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z in (-oo:+oo)
(2*z)/7-3 = -8 // + 8
(2*z)/7-3+8 = 0
2/7*z+5 = 0 // - 5
2/7*z = -5 // : 2/7
z = -5/2/7
z = -35/2
z = -35/2
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