Example

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

Question

$$\frac { 4 n + 16 } { n ^ { 2 } - 16 } + \frac { - 4 } { 4 + x }$$

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