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x in (-oo:+oo)
8-((5/2)*x) = -3 // + 3
3-((5/2)*x)+8 = 0
(-5/2)*x+3+8 = 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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