add -
4a+3b and 9a-5b
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(4a + 3b) + (9a - 5b)
= 4a + 3b + 9a - 5b
= 4a + 9a + 3b - 5b
= (4a + 9a) + (3b - 5b)
= 13a + (-2b)
= 13a - 2b
Therefore (4a + 3b) + (9a - 5b) = 13a - 2b
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