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3+2*A+B*4/2-4 = 3 + 2A + 2B - 4 = 2A + 2B - 1
3 + 5 = 4*b so 8 = 4*b Divide both sides by 4: 2 = b
(a + 2 - b) (a + 2 + b)
10a + 5b
3b+4 = b+12 3b-b = 12-4 2b = 8 b = 4