Could someone tell me what I did wrong?
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Try this $\displaystyle 16^{5x-3}= 64$ $\displaystyle (4^2)^{5x-3}= 4^3$ $\displaystyle 4^{2(5x-3)}= 4^3$ $\displaystyle 2(5x-3)= 3$ Can you finish it?
yes, thank you
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