$3xy+6y+8+4x$
$8\left(2n+2\right)+8n$
$f\left(x\right)=\left(\frac{2}{5}\right)^{-x}$
$-64-\left(-21\right)-13$
$25x^2-25y^4$
$\frac{64x^{3}-12x^{2}-6t}{3x}$
$\frac{1}{2}\cdot\frac{u^{\frac{1}{2}}}{\frac{1}{2}}$
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