$9a^2-30a$
$c+d^2-18\left(c+d\right)+65$
$6x^4-2x^4$
$24x^2y^7+48x^4y^5-32x^6y^9$
$a^3+5a+a\cdot a^2-a+5$
$\int\left(2x+5\right)\cdot\cos\left(3x\right)dx$
$\left(6x-3\right)+\frac{3x-2x}{1^2}5x^2$
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