Example

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

Question

$$\quad 4 ^ { x } + \frac { 1 } { 4 ^ { x } } = \frac { 257 } { 16 }$$

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