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x in (-oo:+oo)
9 = (15/11)*(x-19) // - (15/11)*(x-19)
9-((15/11)*(x-19)) = 0
(-15/11)*(x-19)+9 = 0
9-15/11*(x-19) = 0
9-15/11*(x-19) = 0
384/11-15/11*x = 0
384/11-15/11*x = 0
384/11-15/11*x = 0 // - 384/11
-15/11*x = -384/11 // : -15/11
x = -384/11/(-15/11)
x = 128/5
x = 128/5
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