$\left(19x^2+11\right)e^{w^2}$
$1\:320\:+\:520\:-880\:+\:1250$
$2a^2+5a+6\cdot3a+2$
$-2x+5\ge4x-4$
$9x^2+16y^2=4z^2$
$r^2-18r+16$
$1296\cdot1.375$
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