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z in (-oo:+oo)
z/5-6 = 13/6 // - 13/6
z/5-(13/6)-6 = 0
z/5-13/6-6 = 0
1/5*z-49/6 = 0 // + 49/6
1/5*z = 49/6 // : 1/5
z = 49/6/1/5
z = 245/6
z = 245/6
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