$\left(1+i\right)^{-t}$
$1+\left\{3+5+6\right\}-\left[23+12\:-63+23\right]-\left(3+5+7\right)-\left[-6\right]\left\{+18\right\}$
$3\:x\:+\:y\:-\:2\:z\:=\:4$
$5x+3+2x-y$
$\left(x^2+x-20\right)+\left(x+5\right)$
$16x-20y=-5\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:$
$\left(3x+5\right)\left(4x-7\right)$
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