$2x-x+5x-9x=\:$
$\frac{1}{2}a+a$
$2\left(2n^2+n-4\right)$
$15x-11x^2-12$
$-100\cdot\left(-6\right)\cdot3\cdot4$
$\left(a-x\right)\left(x+n\right)$
$6x^3+12x^2-2x$
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