Add: a) 2/9+{3/9}
b) 4/7+{6/7}
c) 2/6+3/7
d) 3/8+4/3+2/7
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Step-by-step explanation:
a.2/9=5/9
b.4/7+6/7=10/7
c.2/6+3/7=32/42
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