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x in (-oo:+oo)
39 = (13*x)/2 // - (13*x)/2
39-((13*x)/2) = 0
(-13/2)*x+39 = 0
39-13/2*x = 0 // - 39
-13/2*x = -39 // : -13/2
x = -39/(-13/2)
x = 6
x = 6
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