Example

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

Question

$$( ) : 2 ^ { x + 3 } + \frac { 1 } { 2 ^ { x } } - 9 = 0$$

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