1a
-56x2
3a
46
2a
49x8
6
3
1b
-27x7
3b
1/87
2b
-125r27
10
1c
r4
3c
1/x6
2c
8a9b21
12a
m=-15
m=15
11a
-20x11
11c
2/n
2d
64/x15
12b
y=-9
y=9
1d
24x9y3
3f
m/n
11d
49/t6
8
1
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