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

User Bers
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25^(-x+2)=\left((1)/(5)\right)^x\\ 5^(2(-x+2))=5^(-x)\\ 2(-x+2)=-x\\ -2x+4=-x\\ x=4
User Voodoo
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