$+2.1-3.6$
$\left(-a+1\right)\left(-a-1\right)$
$\sqrt[3]{5^9}+\sqrt[8]{16^4}$
$-x^2+4x-1$
$3b^2+18b+15$
$\left(-17+2\cdot4\right)$
$10\cdot\left(-1\right)-1$
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