$5\sqrt{7}+3\sqrt{7}$
$-x^2+2ab+a^2+b^2-x^2+2ab+a^2+b^2$
$\left(\left(1+0.25\right)^{\frac{3}{12}}-1\right)$
$2z'+3z=8$
$\frac{sin\:x}{cos\:x\:+\:1}+cot\:x$
$26\cdot50$
$\frac{27x^{-10.666}}{9y^{14}}\left(\frac{15y^{-3}}{6x^2}\right)$
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