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x in (-oo:+oo)
(2^-2*x)/3 = 4/5 // - 4/5
(2^-2*x)/3-(4/5) = 0
(2^-2*x)/3-4/5 = 0
1/12*x-4/5 = 0 // + 4/5
1/12*x = 4/5 // : 1/12
x = 4/5/1/12
x = 48/5
x = 48/5
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