$3x^2+4x^2-5x^2$
$\left(1+4x^3\right)dy+12x^2y^4dx=0$
$\left(x-5\right)\left(x^2+5x+2\right)$
$3x^2-10x$
$-2.1n-8\left(-8.7n+5.4\right)$
$16mn+2mn+9n^2$
$5x^2+45x+90$
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