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x in (-oo:+oo)
2/43 = x/13 // - x/13
2/43-(x/13) = 0
2/43-1/13*x = 0 // - 2/43
-1/13*x = -2/43 // : -1/13
x = -2/43/(-1/13)
x = 26/43
x = 26/43
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