$2x-12\le13-3x$
$784-\left\{5+\left[3-132:-2\right].7\right\}$
$4+3+5+2\:+4+4.24$
$90-\left(-49\right)$
$16-3+15-24+2$
$\left(a^4+7\right)\left(a^6-9\right)$
$\left(-7+17\right)-\left(-1-8\right)$
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