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z in (-oo:+oo)
z/5-4 = (1*2)/6 // - (1*2)/6
z/5-((1*2)/6)-4 = 0
z/5-1/3-4 = 0
1/5*z-13/3 = 0 // + 13/3
1/5*z = 13/3 // : 1/5
z = 13/3/1/5
z = 65/3
z = 65/3
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