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m in (-oo:+oo)
7-7*m-(3*m) = -23 // + 23
7-7*m-(3*m)+23 = 0
7-7*m-3*m+23 = 0
30-10*m = 0 // - 30
-10*m = -30 // : -10
m = -30/(-10)
m = 3
m = 3
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