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m in (-oo:+oo)
-40 = 2-3*m-(3*m) // - 2-3*m-(3*m)
3*m-(-3*m)-40-2 = 0
3*m+3*m-40-2 = 0
6*m-42 = 0 // + 42
6*m = 42 // : 6
m = 42/6
m = 7
m = 7
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