$-6-\left(-18\right)$
$1+50+22$
$3\left(-3\right).3\left(0\right).3\left(2\right)$
$\frac{3a^2b^2c^2-2abc+ab^2c}{abc}$
$8^7.8^4$
$\left(2x-y+3z-4\right)^2$
$\left(x+4\right)^2-\left(x+4\right)$
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