Without using a calculator, find the value of x for which a. log 5 x = 4

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Without using a calculator, find the value of x for which

a. log5 x = 4

b. logx 81 = 2 

c. log7 x = 1

d. log2 (x − 1) = 3 

e. log3 (4x + 1) = 4 

f. logx (2x) = 2

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