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\frac{2}{3}-\frac{2}{x^{2}}
Cancel out x in both numerator and denominator.
\frac{2x^{2}}{3x^{2}}-\frac{2\times 3}{3x^{2}}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of 3 and x^{2} is 3x^{2}. Multiply \frac{2}{3} times \frac{x^{2}}{x^{2}}. Multiply \frac{2}{x^{2}} times \frac{3}{3}.
\frac{2x^{2}-2\times 3}{3x^{2}}
Since \frac{2x^{2}}{3x^{2}} and \frac{2\times 3}{3x^{2}} have the same denominator, subtract them by subtracting their numerators.
\frac{2x^{2}-6}{3x^{2}}
Do the multiplications in 2x^{2}-2\times 3.