$6x+5y+5z=39$
$20x+40y+z=10$
$1\cdot9$
$\log_{b}\frac{2}{8}$
$\frac{-4x^{10}}{-7xy^2}$
$\frac{cot\left(-t\right)+tan\left(-t\right)}{cot\left(t\right)}=-sec\left(t\right)$
$5x^2-15x^2+25x^2$
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