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x in (-oo:+oo)
2*y = 19-((1/2)*x) // - 19-((1/2)*x)
(1/2)*x+2*y-19 = 0
1/2*x+2*y-19 = 0 // - 2*y-19
1/2*x = -(2*y-19) // : 1/2
x = (-(2*y-19))/1/2
x = 2*(19-(2*y))
x = 2*(19-(2*y))
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