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x in (-oo:+oo)
3-((1/2)*x) = 5*x-8 // - 5*x-8
3-((1/2)*x)-(5*x)+8 = 0
(-1/2)*x-5*x+3+8 = 0
11-11/2*x = 0 // - 11
-11/2*x = -11 // : -11/2
x = -11/(-11/2)
x = 2
x = 2
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