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m in (-oo:+oo)
-(2*m)-7 = 5*m-77 // - 5*m-77
77-(2*m)-(5*m)-7 = 0
77-2*m-5*m-7 = 0
70-7*m = 0 // - 70
-7*m = -70 // : -7
m = -70/(-7)
m = 10
m = 10
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