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m in (-oo:+oo)
0 = 3*m+7*m+10 // - 3*m+7*m+10
0-(3*m)-(7*m)-10 = 0
-3*m-7*m-10 = 0
-10*m-10 = 0 // + 10
-10*m = 10 // : -10
m = 10/(-10)
m = -1
m = -1
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