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z in (-oo:+oo)
(1/5)*(4*z-10) = (4/5)*z-2 // - (4/5)*z-2
(1/5)*(4*z-10)-((4/5)*z)+2 = 0
(1/5)*(4*z-10)+(-4/5)*z+2 = 0
1/5*(4*z-10)+(-4*z)/5+2 = 0
(1/5*5*(4*z-10))/5+(-4*z)/5+(2*5)/5 = 0
1/5*5*(4*z-10)-4*z+2*5 = 0
10-10 = 0
0 = 0
0/5 = 0
0/5 = 0 // * 5
0 = 0
0 = 0
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z in (-oo:+oo)
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