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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
7*y-3/4*x = 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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