$3a^2+6a^2$
$a-1\cdot a+2$
$y=3-4x-x^2$
$5-4+9-4+5-\left(-2\right)$
$\left(3m^2+\frac{1}{9}m\right)^3$
$\:7\left(9x+18y\right)$
$a+b+a+b$
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