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z in (-oo:+oo)
(70-z)/(70-60) = 0.1 // - 0.1
(70-z)/(70-60)-0.1 = 0
(70-z)/10-0.1 = 0
(70-z)/10+(-0.1*10)/10 = 0
70-z-0.1*10 = 0
69-z = 0
(69-z)/10 = 0
(69-z)/10 = 0 // * 10
69-z = 0
69-z = 0 // - 69
-z = -69 // * -1
z = 69
z = 69
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