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x in (-oo:+oo)
8 = 3*x-(5/2) // - 3*x-(5/2)
5/2-(3*x)+8 = 0
5/2-3*x+8 = 0
21/2-3*x = 0 // - 21/2
-3*x = -21/2 // : -3
x = -21/2/(-3)
x = 7/2
x = 7/2
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