$\left[3\cdot\left(2-4\right)\right]^2$
$2a^2x\:3a^3$
$b+b^3$
$-4\cdot\left(1+7\right)$
$-3\:-1\:-5\:+\:15\:-12$
$5x^2+8x+5$
$2x+1\:a\:-2$
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