$a\:+\:b\:-\:12\:-\:x\:+\:2a\:$
$\int\frac{x^2}{\sqrt{1+2x}}dx$
$128.8x^4+27xy^{3n}$
$\left(\frac{2}{7}x+9\right)^3$
$3\cdot3^2\cdot3^3\cdot3^4$
$\frac{x^2+2x+5}{x+3}$
$x^2-5x=-3$
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