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