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x in (-oo:+oo)
7*y = (-3/4)*x // - (-3/4)*x
7*y-((-3/4)*x) = 0
(3/4)*x+7*y = 0
3/4*x+7*y = 0 // - 7*y
3/4*x = -(7*y) // : 3/4
x = (-(7*y))/3/4
x = -28/3*y
x = -28/3*y
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