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m in (-oo:+oo)
(-1/2)*m+3 = 57 // - 57
(-1/2)*m-57+3 = 0
-1/2*m-54 = 0 // + 54
-1/2*m = 54 // : -1/2
m = 54/(-1/2)
m = -108
m = -108
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