$9.6-7.7$
$5+4k+9$
$\left(1-\frac{x}{4}\right)^r$
$-1294-2845$
$6\left(-4+2x\right)+9\left(4x-7\right)$
$4\:x\:-\:y\:+\:5\:x\:+\:2\:x\:-\:y\:\:$
$\left(5+4i\right)-\left(6+2i\right)$
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