Example

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

Question

$$y = \frac { 7 } { x ^ { - 4 } } + \frac { 1 } { x ^ { 4 } } - x ^ { - 1 }$$

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