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