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m in (-oo:+oo)
200-(m/50) = 1200 // - 1200
200-(m/50)-1200 = 0
-1/50*m-1000 = 0 // + 1000
-1/50*m = 1000 // : -1/50
m = 1000/(-1/50)
m = -50000
m = -50000
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