$4x+4x-4x+4$
$10\sqrt{5}-12\sqrt{5}+3\sqrt{5}-4\sqrt{5}$
$x+x+2+2+\frac{2}{x-\sqrt{1}}$
$15-7+3-6+12-9-4$
$-\frac{2}{5}+1\frac{4}{3}-1+\frac{2}{3}-6\frac{1}{2}-\frac{9}{2}-\frac{15}{4}$
$7-4+9-5$
$-8+9+5-\left(12+16-24\right)$
Combining like terms
~ 0.03 s
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