$\frac{6}{9}+\frac{1}{3}$
$26\:.\:-20$
$7x+x\:-8=2\left(4x-4\right)$
$4m+-3m+7+-10m+8m$
$\int_0^{3.15}\left(\sqrt{19.89-x^2}\right)dx$
$x-4<x\cdot\left(x-3\right)$
$x+\sqrt{x-1}=1$
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