$-7\:\cdot\:4$
$-6xy\:+\:9xy\:-\:2$
$\lim_{x\to-1}\sqrt{51-2x}$
$\:dydx\:=\sqrt{ax+b}$
$x^3+2x^2+3x+6$
$\frac{5^{12}y^{20}}{5^7y^8}$
$8\cdot\:\left(-6-4\right)-10\cdot\:\left(5-\left(2\cdot\:4-6\right)+5\right)$
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