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m in (-oo:+oo)
m/12+18 = 20.666 // - 20.666
m/12-20.666+18 = 0
1/12*m-2.666 = 0 // + 2.666
1/12*m = 2.666 // : 1/12
m = 2.666/1/12
m = 31.99200128
m = 31.99200128
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