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x in (-oo:+oo)
5-((1/4)*x) = 9 // - 9
5-((1/4)*x)-9 = 0
(-1/4)*x-9+5 = 0
-1/4*x-4 = 0 // + 4
-1/4*x = 4 // : -1/4
x = 4/(-1/4)
x = -16
x = -16
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