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To simplify the expression (14x^2 - 3x + 2.25) + (0.75x^2 + 2x - 14), we can combine like terms:
14x^2 + 0.75x^2 - 3x + 2x + 2.25 - 14
Combining the x^2 terms, x terms, and constants:
14.75x^2 - x - 11.75