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9a + 3b - 11a - 4b = -2a -b
3b -1
Change the order to make it more obvious: 3a - a + 2b + 4b 2a + 6b or 2 (a + 3b).
2a-6a-a=b+4b-4b -5a=5b-4b -5a=1b a=-5 b=1
-7+3b = 4b-8 3b-4b = -8+7 -b = -1 b = 1