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m in (-oo:+oo)
2*(5-(6*m)) = -74 // + 74
2*(5-(6*m))+74 = 0
2*(5-6*m)+74 = 0
2*(5-6*m)+74 = 0
84-12*m = 0
84-12*m = 0
84-12*m = 0 // - 84
-12*m = -84 // : -12
m = -84/(-12)
m = 7
m = 7
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