$\left(10c+15d\right)^2$
$4+3\cdot5\cdot\left(2+3\right)-7+4\left(1-3\right)$
$5t-20t^2=0$
$\frac{x^2-5x+8}{x+3}$
$\left(y^{\frac{3}{2}}x^{-\frac{1}{2}}\right)^4$
$\frac{2x+3}{x+5}-\frac{x-3}{x+5}$
$\left(\frac{1}{2}+b\right)\left(\frac{1}{2}-b\right)$
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