$12a-6ab+17ac+1ab$
$1.1z^{-2}+0.5z^{-2}$
$4x^4\cdot4x^0$
$\frac{\frac{25}{a-5}-\frac{4}{a-5}}{\frac{a-5}{4}-\frac{4}{a-5}}$
$9w^2-48wy+64y^2$
$\left(3x+2c\right)\left(3x+4c\right)$
$12x^2-5x-2$
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