$5\cdot\left(2x+3\right)\cdot\left(2x-3\right)-5\cdot\left(x-2\right)^2$
$c\:\log_d\left(x\right)-b\:\log_d\left(y\right)$
$16m^2-100$
$2xy-y-x-x$
$4\cdot\left(4\right)-3$
$i ( 2 + i )$
$1d^2+6d^2+5+2$
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