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x in (-oo:+oo)
(3/4)*y = (2/6)*x // - (2/6)*x
(3/4)*y-((2/6)*x) = 0
(-1/3)*x+(3/4)*y = 0
3/4*y-1/3*x = 0 // - 3/4*y
-1/3*x = -(3/4*y) // : -1/3
x = (-(3/4*y))/(-1/3)
x = 9/4*y
x = 9/4*y
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