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x in (-oo:+oo)
8/13 = x/65 // - x/65
8/13-(x/65) = 0
8/13-1/65*x = 0 // - 8/13
-1/65*x = -8/13 // : -1/65
x = -8/13/(-1/65)
x = 40
x = 40
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