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x in (-oo:+oo)
x/12 = x/13-15 // - x/13-15
x/12-(x/13)+15 = 0
1/156*x+15 = 0 // - 15
1/156*x = -15 // : 1/156
x = -15/1/156
x = -2340
x = -2340
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