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z in (-oo:+oo)
z/15 = 28/35 // - 28/35
z/15-(28/35) = 0
z/15-4/5 = 0
1/15*z-4/5 = 0 // + 4/5
1/15*z = 4/5 // : 1/15
z = 4/5/1/15
z = 12
z = 12
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