exam Maths Puzzle Numerical Ability

I am comlpetley lost at how to begin to solve this problem
here is the question
4/3 = 8
-
b

the way it is written in the book is 4/3 divided by b equals 8

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i need some help in algebra 1 pg.364 #18 and #20 Chapter 6,6.7 page 141 number 25