9. What should be subtracted from 5x + 6x2 - 6 to get 7x2 + 3 5 2 133
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question is not correct.
second number is wrong.
Let the number be y.
5x + 6x² - 6 - y = second number
y = second number - 5x + 6x² - 6
May it helps you.
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