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x in (-oo:+oo)
y = (7/3)*x // - (7/3)*x
y-((7/3)*x) = 0
(-7/3)*x+y = 0
y-7/3*x = 0 // - y
-7/3*x = -y // : -7/3
x = -y/(-7/3)
x = 3/7*y
x = 3/7*y
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