$4+-13+-8$
$2x+\frac{1}{4}y+\frac{3}{4}x+y$
$1+x-x^2\:yz-x^3\:yz$
$6n+2$
$\lim_{x\to0}lnsin\left(2x\right)^x$
$-31\:+4$
$7x=49$
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