What should be added to 7r - 5x + 1 to get -3r-47-72
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Let the value y be added to 7x2−5x+1 to give 3x2+4x+7
y=3x2+4x+7−(7x2−5x+1)
=3x2+4x+7−7x2+5x−1
=−4x2+9x+6
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