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x in (-oo:+oo)
13 = 2*x+(-1/2)*y // - 2*x+(-1/2)*y
13-(2*x)-((-1/2)*y) = 0
(1/2)*y-2*x+13 = 0
1/2*y-2*x+13 = 0 // - 1/2*y+13
-2*x = -(1/2*y+13) // : -2
x = (-(1/2*y+13))/(-2)
x = (1/2*y+13)/2
x = (1/2*y+13)/2
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