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x in (-oo:+oo)
2/3-(x/4) = 1/13 // - 1/13
2/3-(x/4)-(1/13) = 0
2/3-(x/4)-1/13 = 0
23/39-1/4*x = 0 // - 23/39
-1/4*x = -23/39 // : -1/4
x = -23/39/(-1/4)
x = 92/39
x = 92/39
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