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\frac{4\times 2}{2}-\frac{\sqrt{5}}{2}
To add or subtract expressions, expand them to make their denominators the same. Multiply 4 times \frac{2}{2}.
\frac{4\times 2-\sqrt{5}}{2}
Since \frac{4\times 2}{2} and \frac{\sqrt{5}}{2} have the same denominator, subtract them by subtracting their numerators.
\frac{8-\sqrt{5}}{2}
Do the multiplications in 4\times 2-\sqrt{5}.