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z in (-oo:+oo)
(z+5)/7 = -3 // + 3
(z+5)/7+3 = 0
(z+5)/7+(3*7)/7 = 0
z+3*7+5 = 0
z+26 = 0
(z+26)/7 = 0
(z+26)/7 = 0 // * 7
z+26 = 0
z+26 = 0 // - 26
z = -26
z = -26
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