$\left(4x^2-7x\right)^3$
$\frac{1}{81}x^4-16$
$5x^2+19x-4=0$
$y^4+4y+3$
$2xy+7x^2y+xy^2$
$18x+11x$
$\left(+2\right)-\left(-16\right)-\left(+22\right)$
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