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x in (-oo:+oo)
(2/5)*y = (1/2)*x // - (1/2)*x
(2/5)*y-((1/2)*x) = 0
(-1/2)*x+(2/5)*y = 0
2/5*y-1/2*x = 0 // - 2/5*y
-1/2*x = -(2/5*y) // : -1/2
x = (-(2/5*y))/(-1/2)
x = 4/5*y
x = 4/5*y
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