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In this case there is no operator between "7 over 8" and "1 over 10".
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1/5 plus 1/7 plus 3/10 is equal to 0.642857
no, because 3 over 5 is equal to .6, while 7 over 10 is equal to .7
8 over -7 equal = 1
7/10 + 2/10 = 9/10
7/10 x 10/7 =7/7 which is 1 whole