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6a+7b
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No
2a-6a-a=b+4b-4b -5a=5b-4b -5a=1b a=-5 b=1
9a + 3b - 11a - 4b = -2a -b
-7+3b = 4b-8 3b-4b = -8+7 -b = -1 b = 1
6+7a+6b