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? = x 〖(8/5)〗^2x × 〖(5/8)〗^(3x-3)= 5/8 ⇒ 〖(5/8)〗^(-2x) × 〖(5/8)〗^(3x-3)= 5/8 ⇒ (5/8)^(-2x+3x-3) = 5/8 ⇒ (5/8)^(x-3) = 5/8 ⇒x-3=1 ⇒x=4
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