11. From the sum of 7 + 3r and 6 - 2r , subtract the sum of 2 - 3x and 2 + 3x _9
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(2 - 3x + 2 + 3x - 9 ) - ( 7+ 3r + 6 - 2r )
2 - 3x + 2 + 3x - 9 - 7 - 3r - 6 + 2r
3x - 3x + 2r - 3r + 2 + 2 - 9 - 7 - 6
- r - 18
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Hope it is correct i am not sure about the answer
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