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x in (-oo:+oo)
56 = (5/4)*x // - (5/4)*x
56-((5/4)*x) = 0
(-5/4)*x+56 = 0
56-5/4*x = 0 // - 56
-5/4*x = -56 // : -5/4
x = -56/(-5/4)
x = 224/5
x = 224/5
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