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x= 9/7
2) 5/7 + x = 4→ x= 4/1 - 5/7 → x= 28/7 -5/7
x= 23/7
3) 7/5 - x = 1→ -x= 1/1 - 7/5 → -x= 5/5 -7/5 → -x= - 2/5
x= 2/5
4) 9/4 - x = 2→ -x= 2/1 - 9/4 → -x= 8/4 -9/4 → -x= - 1/4
x= 1/4
5) 9/4 - x = 1→ -x= 1/1 - 9/4 → -x= 4/4 -9/4 → -x= - 5/4
x= 5/4