$19^2$
$9 ( 5 v - 3 ) + 4 ( 2 v + 5 )$
$\left(x+3\right)-7$
$x\:-\:y\:+\:2y$
$-214.1\left(2.3\right)$
$2x^2-16x+32$
$4+56x+49$
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