$7x\:para\:x=5$
$\left(r-3t\right)\left(r+3t\right)$
$\frac{d}{dz}x+y$
$3+58-56-100+30$
$\frac{v-4}{2v+4}$
$x\left(x-2\right)=x+10$
$\ln\left(x^2-25\right)-\ln\left(x+5\right)$
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