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