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