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x in (-oo:+oo)
(1/2)*y = 7-4*x // - 7-4*x
(1/2)*y-(-4*x)-7 = 0
4*x+(1/2)*y-7 = 0
4*x+1/2*y-7 = 0 // - 1/2*y-7
4*x = -(1/2*y-7) // : 4
x = (-(1/2*y-7))/4
x = (7-(1/2*y))/4
x = (7-(1/2*y))/4
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