$$\left. \begin{array} { l } { 6 x + 4 x - 1 } \\ { 9 x \theta } \end{array} \right.$$
$9x\theta \left(10x-1\right)$
$$9x\theta \left(10x-1\right)$$
$$90\theta x^{2}-9x\theta $$
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$10x-1,\ 9x\theta $
