4/7 - 4/m need a common denominator--multiply the first term by m/m and the second by 7/7
4m/7m - 28/7m
(4m-28)/7m OR 4/7 - 4/m
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The LCM of 3/7 and 4/m is 7*m if m is not a multiple of 7, and m if m is a multiple of 7.
m = 3
m=-0.2
-45m + 68 = 84m - 61 39m = 7 m = 7/39
7 = 28/4