1 answer
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Step 1: Remove the parentheses
9x^3 + 2x^2 - 5x + 4 - 5x^3 + 7x - 7
Step 2: Combine like terms
9x^3 - 5x^3 + 2x^2 - 5x + 7x + 4 - 7
Step 3: Simplify the terms
4x^3 + 2x^2 + 2x - 3