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x in (-oo:+oo)
(x-3)/(-2) = 15 // - 15
(x-3)/(-2)-15 = 0
(x-3)/(-2)+(-15*(-2))/(-2) = 0
x-15*(-2)-3 = 0
x+27 = 0
(x+27)/(-2) = 0
(x+27)/(-2) = 0 // * -2
x+27 = 0
x+27 = 0 // - 27
x = -27
x = -27
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