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2a-6a-a=b+4b-4b -5a=5b-4b -5a=1b a=-5 b=1
9a + 1
1/4
ab + 4 + a + 4b factors to (a + 4)(b + 1)
-7+3b = 4b-8 3b-4b = -8+7 -b = -1 b = 1