$2x-7x+5x-x-8x+9x-3x$
$3mn^{10+2mn^2^2}$
$4\cdot3+5\cdot2+1\cdot5\cdot3+7$
$\left(\frac{1}{8}a-\left(\frac{3}{4}b\right)^2\right)$
$\left(3x-4y\right)\left(9x^2+12xy+16y^2\right)$
$\lim_{x\to0}\left(1+6x\right)^{\frac{1}{x}}$
$-7^5$
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