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\frac{3x^{2}x^{2}}{x^{2}}-\frac{3}{x^{2}}
To add or subtract expressions, expand them to make their denominators the same. Multiply 3x^{2} times \frac{x^{2}}{x^{2}}.
\frac{3x^{2}x^{2}-3}{x^{2}}
Since \frac{3x^{2}x^{2}}{x^{2}} and \frac{3}{x^{2}} have the same denominator, subtract them by subtracting their numerators.
\frac{3x^{4}-3}{x^{2}}
Do the multiplications in 3x^{2}x^{2}-3.