exam Maths Puzzle Numerical Ability

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

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exam Other Question

Eight times the sum of a number and -2 is the same as nine times the numbers. Find the number. 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