$-784+456$
$6-4\cdot3-2$
$\frac{1-w^{11}}{1+w}$
$5x-4+3x+2-16-18x+3-4x$
$x^2y''\:\:xy'\:+\:y\:=\:0$
$x^2+18x-3$
$\left(\frac{1}{2^n}-\frac{1}{2^{2n}}\right)$
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