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m in (-oo:+oo)
-2 = m/3+5 // - m/3+5
-(m/3)-5-2 = 0
-1/3*m-7 = 0 // + 7
-1/3*m = 7 // : -1/3
m = 7/(-1/3)
m = -21
m = -21
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