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z in (-oo:+oo)
(4/5)*z+(1/3)*z = 12 // - 12
(4/5)*z+(1/3)*z-12 = 0
17/15*z-12 = 0 // + 12
17/15*z = 12 // : 17/15
z = 12/17/15
z = 180/17
z = 180/17
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