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x in (-oo:+oo)
y = (7/6)*x // - (7/6)*x
y-((7/6)*x) = 0
(-7/6)*x+y = 0
y-7/6*x = 0 // - y
-7/6*x = -y // : -7/6
x = -y/(-7/6)
x = 6/7*y
x = 6/7*y
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