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m in (-oo:+oo)
-27 = m-3*m-9 // - m-3*m-9
9-(-3*m)-m-27 = 0
3*m-m-27+9 = 0
2*m-18 = 0 // + 18
2*m = 18 // : 2
m = 18/2
m = 9
m = 9
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