$\frac{10x^5}{5x}$
$7^2-5\cdot2+3^2$
$-5x^2-3x+11$
$\log3\left(2x-5\right)=2$
$\lim_{x\to\frac{\pi}{4}}\left(\frac{\sin\left(2x\right)-1}{4x-\pi}\right)$
$13a-\frac{1}{3}b,\:a=-1,\:b=-21$
$\left(ab^3-a^2\right)^2$
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