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x in (-oo:+oo)
(x-8)/(39-8) = 0.3 // - 0.3
(x-8)/(39-8)-0.3 = 0
(x-8)/31-0.3 = 0
(x-8)/31+(-0.3*31)/31 = 0
x-0.3*31-8 = 0
x-17.3 = 0
(x-17.3)/31 = 0
(x-17.3)/31 = 0 // * 31
x-17.3 = 0
x-17.3 = 0 // + 17.3
x = 17.3
x = 17.3
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