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x in (-oo:+oo)
x/(-2) = 5-4 // - 5-4
x/(-2)-5+4 = 0
-1/2*x-1 = 0 // + 1
-1/2*x = 1 // : -1/2
x = 1/(-1/2)
x = -2
x = -2
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