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