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= 2a + 6b - 2 + 4a - 2b + 8
= 2a + 4a + 6b - 2b -2 + 8
= 6a + 4b + 6
b. ( y + 2x + 4) - (2x + 3y -5)
= y + 2x + 4 - 2x - 3y + 5
= 2x - 2x + y - 3y + 4 + 5
= -2y + 9