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-a2+a
-x+0.8y+3.6
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x+4y-7
10x-7y
16x+16
79xy-2512x-12y
-6x+9y
10x2-9x+5
13a-5b-7c
9y+8
-2x+2.5y
2x-3
-2x+27
3a+24
132x-163
9a-16b
x2+11y2
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9x35+71y35
11a12-b12
-16a4b3
15a2b2c
72p4q3r5
-x4y442
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-x7y8z948
-189a9b3c5
3x7y8
3x
-6a2
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9a2
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8n4m
-125a
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-q2r23
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