$\frac{x^{2}}{9}-\frac{2xyz}{15}+\frac{y^{2}z^{2}}{25}$
$2x-5=111$
$8x^2-26x+21$
$-\left(-3\right)+\left(-7\right)-\left(-1\right)$
$-100+45-34-34-45-18-\left(-1\right)$
$\left(d^4+d^2+1\right)y=0$
$\left(-\frac{1}{2}ab\right)-\left(\frac{3}{4}ab\right)$
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