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-9a-5a+8a-6a+10b-9b-3b-4b+4+6+9+5=
-20a+8a+10b-16b+24=
-12a-6b+24 R//
10b - 9a + 4 + 6 - 9b - 5a - 3b + 8a + 9 - 6a - 4b + 5
-9a - 5a - 6a + 8a + 10b - 9b -3b - 4b +4 +6+ 9 + 5
-20a+8a + 10b - 16b + 24
-12a - 6b + 24