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m in (-oo:+oo)
m/12-2.1 = -0.9 // + 0.9
m/12-2.1+0.9 = 0
1/12*m-1.2 = 0 // + 1.2
1/12*m = 1.2 // : 1/12
m = 1.2/1/12
m = 14.40000058
m = 14.40000058
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