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x in (-oo:+oo)
x-((13*x^1)/2)+12 = 0
x+(-13/2)*x+12 = 0
12-11/2*x = 0 // - 12
-11/2*x = -12 // : -11/2
x = -12/(-11/2)
x = 24/11
x = 24/11
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