$3a-2a+9a$
$\left(4a+2b-5c\right)^3$
$\left(-8\right)\left(3\right)\left(6\right)$
$\left(-3x^2+6x-12\right)+\left(5x+9\right)$
$\log9=7-\log2$
$\frac{10x^5}{5x}$
$7-8+4-10-6-5-9$
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