$-3x^2+5;\:x=0$
$y'+x=0$
$x'+\frac{\left(3x\right)}{t}=6t^2$
$1-\frac{x}{3}=\frac{5}{x}$
$25x^2-11x^2+1$
$\frac{s}{\left(s+1\right)\left(s+1\right)}$
$61+23-15+17$
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