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x in (-oo:+oo)
-5*y = (165/8)*x // - (165/8)*x
-((165/8)*x)-5*y = 0
(-165/8)*x-5*y = 0
-165/8*x-5*y = 0 // + -5*y
-165/8*x = -(-5*y) // : -165/8
x = (-(-5*y))/(-165/8)
x = -8/33*y
x = -8/33*y
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