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m in (-oo:+oo)
-(7*m)-2 = -72 // + 72
72-(7*m)-2 = 0
72-7*m-2 = 0
70-7*m = 0 // - 70
-7*m = -70 // : -7
m = -70/(-7)
m = 10
m = 10
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