$v^2-18v+81$
$29\left(x^{2}-2x+3\right)\left(x^{2}+2x+3\right)$
$45-5x^2$
$-5-\left(-12\right)$
$-a^4b^2c+2b^3a^2-5a^7b^4d$
$8x+8=8$
$-6-5x^2-7x^2-7y^3+y^3+4+2x^2$
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