$x+5+2x+1+x+5+2x+1$
$5x^2-12x+6$
$\left(\frac{x}{3}-4\right)^2$
$2\left(4^3\right)-7$
$tan\:x\:=\:3.85$
$3x^{2}+2x-5$
$-3xy+5x+6y-8xy$
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