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x in (-oo:+oo)
5-((7/4)*x) = 9 // - 9
5-((7/4)*x)-9 = 0
(-7/4)*x-9+5 = 0
-7/4*x-4 = 0 // + 4
-7/4*x = 4 // : -7/4
x = 4/(-7/4)
x = -16/7
x = -16/7
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