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x in (-oo:+oo)
x/12 = x/13-9 // - x/13-9
x/12-(x/13)+9 = 0
1/156*x+9 = 0 // - 9
1/156*x = -9 // : 1/156
x = -9/1/156
x = -1404
x = -1404
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