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m in (-oo:+oo)
(5/6)*m-((3/4)*m)+3 = 13/6 // - 13/6
(5/6)*m-((3/4)*m)-(13/6)+3 = 0
(5/6)*m+(-3/4)*m-13/6+3 = 0
1/12*m+5/6 = 0 // - 5/6
1/12*m = -5/6 // : 1/12
m = -5/6/1/12
m = -10
m = -10
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