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x in (-oo:+oo)
11/3 = x/13 // - x/13
11/3-(x/13) = 0
11/3-1/13*x = 0 // - 11/3
-1/13*x = -11/3 // : -1/13
x = -11/3/(-1/13)
x = 143/3
x = 143/3
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