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Simplify the following expression: (7x + y) − (5x + 2y). If the final answer is written in the form Ax + By, what is the value of B?

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Simplify the following expression: (2x + 4y) − (4x − 2y). If the final answer is written in the form Ax + By, what is the value of A?

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Simplify the following expression: (7x + y) − (4x − 3y). If the final answer is written in the form Ax + By, what is the value of A?

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