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z in (-oo:+oo)
(11*z)/16+(7*z)/8 = 15/16 // - 15/16
(11*z)/16+(7*z)/8-(15/16) = 0
(11*z)/16+(7*z)/8-15/16 = 0
25/16*z-15/16 = 0 // + 15/16
25/16*z = 15/16 // : 25/16
z = 15/16/25/16
z = 3/5
z = 3/5
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