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m in (-oo:+oo)
12 = (1/4)*((1/2)*m-3) // - (1/4)*((1/2)*m-3)
12-((1/4)*((1/2)*m-3)) = 0
(-1/4)*((1/2)*m-3)+12 = 0
12-1/4*(1/2*m-3) = 0
12-1/4*(1/2*m-3) = 0
51/4-1/8*m = 0
51/4-1/8*m = 0
51/4-1/8*m = 0 // - 51/4
-1/8*m = -51/4 // : -1/8
m = -51/4/(-1/8)
m = 102
m = 102
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