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x in (-oo:+oo)
(4*x+12)/(-8) = 10 // - 10
(4*x+12)/(-8)-10 = 0
(4*x+12)/(-8)+(-10*(-8))/(-8) = 0
4*x-10*(-8)+12 = 0
4*x+92 = 0
(4*x+92)/(-8) = 0
(4*x+92)/(-8) = 0 // * -8
4*x+92 = 0
4*x+92 = 0 // - 92
4*x = -92 // : 4
x = -92/4
x = -23
x = -23
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