$\left(27-27x^4+9x^8-x^{12}\right)x^3$
$8x-2x+4x$
$2x^2+x+.25$
$x^2-6+36$
$2x^9-16y^6$
$-2\left(5x+11\right)+7x+3$
$y'+y=20t$
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