$\frac{a+b}{2}=5$
$\left(5y+1\right)\left(5y-1\right)$
$\cos\left(\frac{\pi}{2}-x\right)=\frac{2}{7}$
$t+4+3-2t$
$a^2+8ab+16b^2$
$100-16z^{2}$
$2\log\left(x\right)-\log\left(x+6\right)=0$
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