$81x^2-12y^2$
$=3x^2-5x+4$
$\frac{12a}{a}$
$6-2-10:5-11$
$\left(2x^4-\:3y^2\right)^2$
$3x^2-7x-6x+14$
$8^2\cdot8^{-3}$
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