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x in (-oo:+oo)
11 = (5/2)*x // - (5/2)*x
11-((5/2)*x) = 0
(-5/2)*x+11 = 0
11-5/2*x = 0 // - 11
-5/2*x = -11 // : -5/2
x = -11/(-5/2)
x = 22/5
x = 22/5
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