$3\:+\:-1\:+\:-4\:$
$18\cdot25$
$x+2-z=-5$
$3e+7-e\:2e+10+2e-3$
$2a^2\:x-5a^2\:y+15by-6bx$
$-54+-18\:x\:+3$
$-x+8\le0$
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