$\left(\frac{12xy}{7x^4}\right)\cdot\left(\frac{7x^5y^2}{4y}\right)$
$\frac{w}{2}-\frac{w+1}{7}$
$24n^2-375n^3$
$2a^3+8a^2+3a+12\cdot2$
$-100-\left(-100\right)-100-\left(-100\right)-100-\left(-100\right)$
$27a^2-72a$
$\frac{\ln\left(0.86\right)}{-0.00012}$
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