Example

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

Question

$$\frac { x - 4 } { x + 4 } + \frac { x + 4 } { x - 4 } = \frac { 4 } { 5 }$$

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