Expressed as a proper fraction in its simplest form, 1/5 + 1/7 = 12/35 or twelve thirty-fifths.
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1/5 plus 1/7 plus 3/10 is equal to 0.642857
-(1/4) + (5/7) = 0.464285714
6 over 7 of course !
.5 or 1/2
5/21 + 1/7 = 56/147 or 8/21