$-10+20-\left(30+15-9+25\right)+50$
$\left(8x-2x^2+2\right)^2$
$x^2-a^3+72^2$
$12\left(8-12\right)-8\left(32-36\right)-20\left(8-5\right)$
$8x^2-32x+32as$
$x^3+y^3=64$
$16a^2\:x^4-25b^4\:y^2$
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