$f^2-12f+36$
$\frac{1+\cos\left(a\right)}{\cos\left(a\right)}$
$\frac{3x-6}{x+7}=0$
$17.21-9.05$
$c\left(x+y+z\right)-\left(x+y+z\right)$
$2\log\left(x\right)-\log\left(4\right)=3\log\left(4\right)$
$-25\cdot7$
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