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m in (-oo:+oo)
2*(-(6*m)-7) = -74 // + 74
2*(-(6*m)-7)+74 = 0
2*(-6*m-7)+74 = 0
2*(-6*m-7)+74 = 0
60-12*m = 0
60-12*m = 0
60-12*m = 0 // - 60
-12*m = -60 // : -12
m = -60/(-12)
m = 5
m = 5
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