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x in (-oo:+oo)
(x-8)/(39-8) = 0.775 // - 0.775
(x-8)/(39-8)-0.775 = 0
(x-8)/31-0.775 = 0
(x-8)/31+(-0.775*31)/31 = 0
x-0.775*31-8 = 0
x-32.025 = 0
(x-32.025)/31 = 0
(x-32.025)/31 = 0 // * 31
x-32.025 = 0
x-32.025 = 0 // + 32.025
x = 32.025
x = 32.025
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