book Maths Puzzle Numerical Ability

Solve the following equations:

a)2^3x-1=1/128 b) ln(4x-3)=1

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book Other Question

c= circumfernce d= diameter r= radius pie= 3.14 or 22/7

c= 44 meters
what is the radius
formula c=2*3.14*r
i do not know the answer a-3/(3a+2) = 1/5