$5a^2+3a+b+a^2-7a+3$
$\left(\frac{3}{4}x-\frac{1}{2}y\right)^2$
$-4x^3+4x^4$
$\frac{x^2}{x^2+1}=1$
$-9x^3-3x^2+3x+1$
$2x^2ex$
$-7\cdot2\cdot1\cdot8$
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