Find the value of 'n' if: [(2/5)7=(2/5) n+7.
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2n-7×5n-⁴ =1250
2n-7×5n-7×5³=1250
= (2×5)n-7=1250/125
= 10n-7=10¹
= n-7=1
= n=7+1=8.
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