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