$\:-40+\:20+\:40\left(-2\right)$
$15-5\cdot2+4\cdot5$
$2-3\sin\left(x\right)=1-5\sin\left(x\right)$
$\frac{\frac{9}{m}}{\frac{1}{8}}$
$\frac{inx}{x^5}$
$\left(3n^4\right)\left(4n^7\right)$
$\frac{x^2+2x-24}{x^2-9}\cdot\frac{x+3}{x^2-16}$
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