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m in (-oo:+oo)
30 = 6*m+7*m+4 // - 6*m+7*m+4
30-(6*m)-(7*m)-4 = 0
30-6*m-7*m-4 = 0
26-13*m = 0 // - 26
-13*m = -26 // : -13
m = -26/(-13)
m = 2
m = 2
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