5 over 7 = 5/7. Multiply both the numerator (top) and the denominator (bottom) of the fraction by any non-zero integer. You will have an equivalent fraction.
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5/7, 10/14, 15/21
Depending if the 5 is in the "over 20" or not. Because what you stated is unclear, it can be (5+7)/20 or 5+7/20, which is two different answers, 0.6 and 5.35.
-2/5 ÷ 7/10 = -4/7
2 over 7 + 3 over 7= 5 over 7
2/7 + 3/7 is 5/7, which can't be simplified.