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x in (-oo:+oo)
40/52 = x/12 // - x/12
40/52-(x/12) = 0
10/13-1/12*x = 0 // - 10/13
-1/12*x = -10/13 // : -1/12
x = -10/13/(-1/12)
x = 120/13
x = 120/13
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