$6\left(a-b\right)=2$
$13-38+7x+2$
$x^2-\left(1+a\right)x+a$
$\left(8\right)\left(2\right)^2\left(-2\right)^0\left(-2\right)$
$-3x^3-2x^2+x$
$\lim_{x\to1}\left(\frac{9^n}{8^n-1}\right)$
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