$\"\"$

The equation is $\"\"$ .

Solve the equation.

$\"\"$ (Original equation)

$\"\"$ (Substitute: $\"\"$ )

$\"\"$ (Definition of negative exponents: $\"\"$ )

Equality for exponential functions property: $\"\"$ if and only if $\"\"$ .

$\"\"$

$\"\"$ (Add $\"\"$ to each side)

$\"\"$ (Apply additive inverse property: $\"\"$ )

$\"\"$

The value of $\"\"$ is $\"\"$ .