$x^2=\:-\:2x\:-\:3$
$9c^2+66c+21$
$-75-+-54$
$5x+6=191$
$\left(2-2\sin\left(x\right)\right)^2$
$13x^2-12x+3=0$
$14xy\:-\:15\:+\:8\:-\:xy\:-\:6\:-\:9x$
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