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m in (-oo:+oo)
2-3*m-(7*m) = -28 // + 28
2-3*m-(7*m)+28 = 0
2-3*m-7*m+28 = 0
30-10*m = 0 // - 30
-10*m = -30 // : -10
m = -30/(-10)
m = 3
m = 3
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