$4500\cdot2.5\cdot4$
$6a^2+14ab$
$\frac{\left(2\cos\left(x\right)^2\right)}{3\sin\left(x\right)}$
$\frac{80}{4}-\frac{60}{20}$
$24.20+6.20$
$-216+104-90$
$15-\left[2-\left(6-10\right)\right]$
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