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