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