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z in (-oo:+oo)
z/2 = (z+1)/10 // - (z+1)/10
z/2-((z+1)/10) = 0
(-1*(z+1))/10+z/2 = 0
(-1*2*(z+1))/(2*10)+(10*z)/(2*10) = 0
10*z-1*2*(z+1) = 0
8*z-2 = 0
(8*z-2)/(2*10) = 0
(8*z-2)/(2*10) = 0 // * 2*10
8*z-2 = 0
8*z-2 = 0 // + 2
8*z = 2 // : 8
z = 2/8
z = 1/4
z = 1/4
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