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m in (-oo:+oo)
7-4*m = 33/7 // - 33/7
7-4*m-(33/7) = 0
7-4*m-33/7 = 0
16/7-4*m = 0 // - 16/7
-4*m = -16/7 // : -4
m = -16/7/(-4)
m = 4/7
m = 4/7
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