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m in (-oo:+oo)
1-(4*m)-(3*m) = 85 // - 85
1-(4*m)-(3*m)-85 = 0
1-4*m-3*m-85 = 0
-7*m-84 = 0 // + 84
-7*m = 84 // : -7
m = 84/(-7)
m = -12
m = -12
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