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x in (-oo:+oo)
y = (17/2)*x // - (17/2)*x
y-((17/2)*x) = 0
(-17/2)*x+y = 0
y-17/2*x = 0 // - y
-17/2*x = -y // : -17/2
x = -y/(-17/2)
x = 2/17*y
x = 2/17*y
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