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m in (-oo:+oo)
-14 = 5*m-(2*m)+7 // - 5*m-(2*m)+7
2*m-(5*m)-14-7 = 0
2*m-5*m-14-7 = 0
-3*m-21 = 0 // + 21
-3*m = 21 // : -3
m = 21/(-3)
m = -7
m = -7
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