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z in (-oo:+oo)
z/12 = 4/5 // - 4/5
z/12-(4/5) = 0
z/12-4/5 = 0
1/12*z-4/5 = 0 // + 4/5
1/12*z = 4/5 // : 1/12
z = 4/5/1/12
z = 48/5
z = 48/5
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