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x in (-oo:+oo)
y/4 = 2*x // - 2*x
y/4-(2*x) = 0
y/4-2*x = 0
1/4*y-2*x = 0 // - 1/4*y
-2*x = -(1/4*y) // : -2
x = (-(1/4*y))/(-2)
x = 1/8*y
x = 1/8*y
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