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x in (-oo:+oo)
(x-8)/(39-8) = 0.217 // - 0.217
(x-8)/(39-8)-0.217 = 0
(x-8)/31-0.217 = 0
(x-8)/31+(-0.217*31)/31 = 0
x-0.217*31-8 = 0
x-14.727 = 0
(x-14.727)/31 = 0
(x-14.727)/31 = 0 // * 31
x-14.727 = 0
x-14.727 = 0 // + 14.727
x = 14.727
x = 14.727
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