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x in (-oo:+oo)
(6*x-18)/(-10) = 9 // - 9
(6*x-18)/(-10)-9 = 0
(6*x-18)/(-10)+(-10*(-9))/(-10) = 0
6*x-10*(-9)-18 = 0
6*x+72 = 0
(6*x+72)/(-10) = 0
(6*x+72)/(-10) = 0 // * -10
6*x+72 = 0
6*x+72 = 0 // - 72
6*x = -72 // : 6
x = -72/6
x = -12
x = -12
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