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m in (-oo:+oo)
38 = 3*m+3*m-10 // - 3*m+3*m-10
10-(3*m)-(3*m)+38 = 0
10-3*m-3*m+38 = 0
48-6*m = 0 // - 48
-6*m = -48 // : -6
m = -48/(-6)
m = 8
m = 8
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