Simplify: $$\frac{81x^2 - 49y^2}{9x+7y}$$
$$\frac{81x^2 - 49y^2}{9x+7y}$$
$$\frac{\left\{\left(9x\right)^2-\left(7x\right)^2\right\}}{9x+7y}$$
$$\frac{\left(9x+7y\right)\left(9x-7y\right)}{\left(9x+7y\right)}$$
$$9x-7y$$
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