$t-\frac{1}{t+1}$
$\left(\left(-4\right)^2\right)^4$
$\frac{25x^2-y^4}{5x-y^2}$
$1-x^5$
$\frac{3x^2-3x+1}{x-2}$
$5h\:=80$
$-\frac{12}{-3}$
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