$8a^2+4a-4$
$\left(3-2\right)^2-3$
$\sin x+3=2-\sin x$
$\frac{9x^2y^4+6x^3y^4-3xy^3}{-3xy}$
$\frac{20x}{4x}$
$17,\:65+9,\:88$
$m^3n^3+1$
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