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x in (-oo:+oo)
((14*x)/(-28))*y-1 = 0
-1/2*x*y-1 = 0 // + 1
-1/2*x*y = 1 // : -1/2*y
x = 1/(-1/2*y)
x = -2*y^-1
x = -2*y^-1
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