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