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x in (-oo:+oo)
(2*x-8)/9 = (4*x-10)/15 // - (4*x-10)/15
(2*x-8)/9-((4*x-10)/15) = 0
(2*x-8)/9+(-1*(4*x-10))/15 = 0
(15*(2*x-8))/(9*15)+(-1*9*(4*x-10))/(9*15) = 0
15*(2*x-8)-1*9*(4*x-10) = 0
-6*x-30 = 0
(-6*x-30)/(9*15) = 0
(-6*x-30)/(9*15) = 0 // * 9*15
-6*x-30 = 0
-6*x-30 = 0 // + 30
-6*x = 30 // : -6
x = 30/(-6)
x = -5
x = -5
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