If we subtract a - 3 from the sum of 2a + b + 1 and 2b - a + 5 we get
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Step-by-step explanation:
( 2a + b + 1 + 2b - a + 5 ) - (a - 3)
( a + 3b + 6 ) - (a - 3)
a + 3b + 6 - a + 3
3b + 9
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