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m in (-oo:+oo)
(-1/4)*m-5 = -3 // + 3
(-1/4)*m-5+3 = 0
-1/4*m-2 = 0 // + 2
-1/4*m = 2 // : -1/4
m = 2/(-1/4)
m = -8
m = -8
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