$1^{30}$
$16+40x^2-14a$
$-2x^2+6x+3$
$-2^2-3-2+3+3^2$
$\frac{6x^4+8x-4}{2x}$
$2x^2+7x-2x^2$
$\left(\frac{3}{4}x-4\right)$
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