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z in (-oo:+oo)
(1/4)*(z-16) = z/2-10 // - z/2-10
(1/4)*(z-16)-(z/2)+10 = 0
1/4*(z-16)-z/2+10 = 0
(1/4*2*(z-16))/2-z/2+(2*10)/2 = 0
1/4*2*(z-16)-z+2*10 = 0
20-1/2*z-8 = 0
12-1/2*z = 0
(12-1/2*z)/2 = 0
(12-1/2*z)/2 = 0 // * 2
12-1/2*z = 0
12-1/2*z = 0 // - 12
-1/2*z = -12 // : -1/2
z = -12/(-1/2)
z = 24
z = 24
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