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