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m in (-oo:+oo)
(1/4)*m-((3/4)*m)-2 = 8 // - 8
(1/4)*m-((3/4)*m)-8-2 = 0
(1/4)*m+(-3/4)*m-8-2 = 0
-1/2*m-10 = 0 // + 10
-1/2*m = 10 // : -1/2
m = 10/(-1/2)
m = -20
m = -20
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