$7x^2+4x-20$
$10^3\cdot10^5$
$40-\left(-21\right)$
$^{3\sqrt{0.125}}$
$5\left(1^2\right)-2\left(4\right)+3$
$\left(k-\frac{1}{5}\right)\left(k-\frac{2}{3}\right)$
$1x\cdot x^2$
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