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x in (-oo:+oo)
x/11 = x/12-15 // - x/12-15
x/11-(x/12)+15 = 0
1/132*x+15 = 0 // - 15
1/132*x = -15 // : 1/132
x = -15/1/132
x = -1980
x = -1980
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