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x=5/18
1 1/5+x=2 9/10
x=8/5
2 3/7-x=2/21
16/21-x=0
-x=-16/21
x=16/21
7/4-1/18x=5/9
43/36-1/8x-0
-1/18x=-43/36
x=43/2
1 3/4+1 5/6x=2 2/3
5/6x-7/12=0
x=7/10