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x in (-oo:+oo)
y-7 = (1/2)*x-4 // - (1/2)*x-4
y-((1/2)*x)-7+4 = 0
(-1/2)*x+y-7+4 = 0
y-1/2*x-3 = 0 // - y-3
-1/2*x = -(y-3) // : -1/2
x = (-(y-3))/(-1/2)
x = -2*(3-y)
x = -2*(3-y)
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