The equation is
.
Apply product property logarithm:
.


Apply exponential formula:
.

Subtract 4 from each side.
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Apply zero product property: ab = 0 then a = 0 or b = 0.
\
Solve the first factor is
.
Subtract 2 from each side.
\
.
Solve the second factor is
.
Subtract 1 from each side.
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Multiply each side by negative one.
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The solutions are
.