$\frac{2x^2-2}{3x^2+6x+3}$
$31-\left(-25\right)-100$
$2x^2+36+81$
$a-a^2$
$-6x-3+1-8x$
$4\cos\left(x\right)^2+5\sin\left(x\right)=3$
$\frac{2x+1}{x-1}+\frac{3}{x}-\frac{2}{x-1}$
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