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x in (-oo:+oo)
y = (6*x)/4 // - (6*x)/4
y-((6*x)/4) = 0
(-3/2)*x+y = 0
y-3/2*x = 0 // - y
-3/2*x = -y // : -3/2
x = -y/(-3/2)
x = 2/3*y
x = 2/3*y
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