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x in (-oo:+oo)
(1/2)*x+(2/5)*y = 8 // - 8
(1/2)*x+(2/5)*y-8 = 0
1/2*x+2/5*y-8 = 0 // - 2/5*y-8
1/2*x = -(2/5*y-8) // : 1/2
x = (-(2/5*y-8))/1/2
x = 2*(8-(2/5*y))
x = 2*(8-(2/5*y))
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