How many solutions to equation (x + 1) (x-2) + (x + 1) (x-4) = 0?
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A2 solutions. - 1 is a solution of the equation.
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B2 solutions. 2 is a solution of the equation.
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C3 solutions. - 1 is a solution of the equation.
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D3 solutions. 2 is a solution of the equation.
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E3 solutions. 4 is a solution of the equation.
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正确答案: A