$1-20cd+100c^2c^2$
$64x^4-36y^8$
$\left\{27-\left(3-4+12\right)+\left(12+15-9\right)-\left(13+2\right)\right\}\cdot3$
$\frac{3x}{2}-7=\frac{x}{4}-2$
$\left(6x-5\right)\left(2x+3\right)g$
$\left(5x+2yz\right)^2$
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