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x in (-oo:+oo)
x/10 = x/11-15 // - x/11-15
x/10-(x/11)+15 = 0
1/110*x+15 = 0 // - 15
1/110*x = -15 // : 1/110
x = -15/1/110
x = -1650
x = -1650
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