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x in (-oo:+oo)
-7*x-(4*y) = 28/(-4) // - 28/(-4)
-7*x-(4*y)-(28/(-4)) = 0
7-7*x-4*y = 0
7-7*x-4*y = 0 // - 7-4*y
-7*x = -(7-4*y) // : -7
x = (-(7-4*y))/(-7)
x = (7-4*y)/7
x = (7-4*y)/7
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