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= 4-2 - 2a+5a -6b+3b
= 2 + 3a -3b
= 3a - 3b + 2
= 4 - 2a - 6b + 5a + 3b - 2
= (5-2)a + (3-6)b + (4-2)
= 3a - 3b + 2