Решите уравнение d+2/9=1-1/9 f-2/7=7/7-3/7

Question

Решите уравнение d+2/9=1-1/9 f-2/7=7/7-3/7

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Answer 1

d+2/9=1-1/9, d+2/9=9/9-1/9, d+2/9=8/9, d=8/9-2/9, d=6/9, d=2/3

f-2/7=7/7-3/7, f-2/7=4,7, f=4/7+2/7, f=6/7