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x in (-oo:+oo)
y = (5/4)*x-(5/9) // - (5/4)*x-(5/9)
y-((5/4)*x)+5/9 = 0
(-5/4)*x+y+5/9 = 0
y-5/4*x+5/9 = 0 // - y+5/9
-5/4*x = -(y+5/9) // : -5/4
x = (-(y+5/9))/(-5/4)
x = 4/5*(y+5/9)
x = 4/5*(y+5/9)
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