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m in (-oo:+oo)
491/56 = 4*m+(4/7)*m-(3/8) // - 4*m+(4/7)*m-(3/8)
491/56-(4*m)-((4/7)*m)+3/8 = 0
(-4/7)*m-4*m+491/56+3/8 = 0
64/7-32/7*m = 0 // - 64/7
-32/7*m = -64/7 // : -32/7
m = -64/7/(-32/7)
m = 2
m = 2
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