$2\left(8\right)^2-2\left(8\right)-4$
$\frac{x^4+2}{x^2+6x+4}$
$\left(3m+2^2\right)$
$\left(8y+x\right)^2$
$5u+8\cdot5v+3$
$\left|3+\left(-5\right)^2\right|$
$r^2+4r-3$
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