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m in (-oo:+oo)
m/6-2.9 = 12.1 // - 12.1
m/6-12.1-2.9 = 0
1/6*m-15 = 0 // + 15
1/6*m = 15 // : 1/6
m = 15/1/6
m = 90
m = 90
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