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x in (-oo:+oo)
y = (8/5)*x-(9/5) // - (8/5)*x-(9/5)
y-((8/5)*x)+9/5 = 0
(-8/5)*x+y+9/5 = 0
y-8/5*x+9/5 = 0 // - y+9/5
-8/5*x = -(y+9/5) // : -8/5
x = (-(y+9/5))/(-8/5)
x = 5/8*(y+9/5)
x = 5/8*(y+9/5)
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