$8x+3-2x-2$
$49x^2-121y^2$
$\int\frac{x^5-6x^3-6x^2-8}{x\left(x^2+9\right)^2}dx$
$\frac{6^{14}}{6^8}$
$-8+8i$
$\left(7x^2+y\right)^2$
$-x+2=3$
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