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X/12 = x/13-11 // - x/13-11
X/12-(x/13)+11 = 0
1/12*X-1/13*x+11 = 0 // - 1/12*X+11
-1/13*x = -(1/12*X+11) // : -1/13
x = (-(1/12*X+11))/(-1/13)
x = 13*(1/12*X+11)
x = 13*(1/12*X+11)
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