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m in (-oo:+oo)
-(4*m)-(3*m)-5 = -68 // + 68
68-(4*m)-(3*m)-5 = 0
68-4*m-3*m-5 = 0
63-7*m = 0 // - 63
-7*m = -63 // : -7
m = -63/(-7)
m = 9
m = 9
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