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x in (-oo:+oo)
x/(-4) = 9-7 // - 9-7
x/(-4)-9+7 = 0
-1/4*x-2 = 0 // + 2
-1/4*x = 2 // : -1/4
x = 2/(-1/4)
x = -8
x = -8
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