Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$\frac{a+c}{a^{2}+ac+c^{2}}+\frac{a-c}{a^{2}-ac+c^{2}}+\frac{2c^{3}}{a^{4}+a^{2}c^{2}+c^{4}}$$

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