(1/4)^(x-4)=1/64
(1/4)^(x-4)=1/(4^3)
(1/4)^(x-4)=(1/4)^3
x-4=3
x=7
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(1/4)^(x-4)=1/64
(1/4)^(x-4)=1/(4^3)
(1/4)^(x-4)=(1/4)^3
x-4=3
x=7