$y=2x^2-6x;\:x=-6$
$\left(-3x^{-3}-\frac{4}{9}y\right)^2$
$a^4-5a^2+9$
$24a^5-12a^3+4a^2$
$\int_2^6\left(2x+1\right)dx$
$6x-2x-5x+2x$
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