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m in (-oo:+oo)
(6/16)*m-((5/8)*m)+9 = 4*m-2*m+13 // - 4*m-2*m+13
(6/16)*m-((5/8)*m)-(-2*m)-(4*m)-13+9 = 0
(6/16)*m+(-5/8)*m+2*m-4*m-13+9 = 0
-9/4*m-4 = 0 // + 4
-9/4*m = 4 // : -9/4
m = 4/(-9/4)
m = -16/9
m = -16/9
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