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2a + 4b - 52a + 4b - 52a + 4b - 52a + 4b - 5
12
4b-b
-4b+2 = 18 -4b = 18-2 -4b = 16 b = -4
5a + 4b - 3a =(5a - 3a) + 4b =2a + 4b =2 (a + 2b)