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x in (-oo:+oo)
-64 = (8/5)*(x-9) // - (8/5)*(x-9)
-((8/5)*(x-9))-64 = 0
(-8/5)*(x-9)-64 = 0
-8/5*(x-9)-64 = 0
-8/5*(x-9)-64 = 0
-8/5*x-248/5 = 0
-8/5*x-248/5 = 0
-8/5*x-248/5 = 0 // + 248/5
-8/5*x = 248/5 // : -8/5
x = 248/5/(-8/5)
x = -31
x = -31
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