Question 482779
The / works well for over (except for radio commo)
{{{4/7 + 5/4 - 1/2}}}
The 3 terms have to have the same denominator to be combined, called "common denominator"  The product of the denominators (regardless of the # of terms) always works.  7*4*2 = 56.  But for this one, it's easy to spot that 2 is a factor of 4, and use 7*4 instead.
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= {{{16/28 + 35/28 - 14/28}}}
= {{{(16 + 35 - 14)/28}}}
= {{{37/28}}}