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m in (-oo:+oo)
-65 = 2*m+5*m-2 // - 2*m+5*m-2
2-(2*m)-(5*m)-65 = 0
2-2*m-5*m-65 = 0
-7*m-63 = 0 // + 63
-7*m = 63 // : -7
m = 63/(-7)
m = -9
m = -9
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