Explicación:
12/20=3/5
20/35=4/7
30/42=5/7
3/5+4/7+5/7=3/5+9/7=(21+45)/35
=66/35
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Verified answer
Explicación:
12/20=3/5
20/35=4/7
30/42=5/7
3/5+4/7+5/7=3/5+9/7=(21+45)/35
=66/35