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x in (-oo:+oo)
(3/5)*y = 6*x // - 6*x
(3/5)*y-(6*x) = 0
(3/5)*y-6*x = 0
3/5*y-6*x = 0 // - 3/5*y
-6*x = -(3/5*y) // : -6
x = (-(3/5*y))/(-6)
x = 1/10*y
x = 1/10*y
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