$\left(x^4-y^4\right)\left(x^4+y^4\right)+y^8$
$\left(x+1\right)^2+\left(y-2\right)^2=9$
$4x^2y+2x-6x^2y-9x$
$x^2-y-2=0$
$-\left(-2\right)+\left(+12\right)+4-3\left(-10\right)-\left(-1\right)$
$98a^2-140a+50$
$8-3\left\{a-2\left(a-\left(b-2\right)+3\left(b-3\right)-6\right)\right\}$
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