$9x^2+z^2-y+18+12$
$x\left(1-e^{3x}\right)$
$\left(6xy^4\right)\left(2xy+3y^2\right)$
$5\left(n+1\right)^2$
$4z^2-4z+1$
$\left(x^3-7c\right)\left(x^3+7c\right)$
$-3\left(x-2\right)=-8x-19$
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