$10g+4+5-10g$
$55gn^2n^3x+110m^2n^3x^2$
$\left(x^2y^3-1\right)^3$
$\cot^2x\left(\sec x-1\right)$
$\left(15^2\right)^2$
$16+5\cdot2$
$6x-x+x$
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