(4/25)^x-2=(5/2)^2x+8
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(4/5)^x-2 = (5/2)^2x+8
2/5^2x-4 = 5/2^2x+8
(5/2)^-2x+4 = (5/2)^2x +8
-2x + 4 = 2x + 8
-2x-2x = 8 - 4
-4x = 4
x = -4/4
x = -1
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