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(6x^3 + 5x²+3)-(3x² - 4x²– 7)

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We have the following:


\left(6x^3+5x^(2)+3\right)-\left(3x^(2)-4x^(2)-7\right)

We reduce similar terms:


\begin{gathered} 6x^3+5x^(2)+3-3x^(2)-4x^(2)-7 \\ 3x^3+x^(2)-4 \end{gathered}

therefore, the answer is 3x^3 + x^2 - 4

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