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in one year,michael read 18 books.this was four fewer than twice the number of books jeff read.how many books did jeff read?

how do i solve this question?i need help
 

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Nathan B. | Elementary and Algebraic skilledElementary and Algebraic skilled
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To solve this, we need a system of equations. Let's look at what we know:
m = 18 (Michael read 18 books)
m = 2j - 4 (Mike read 4 less than twice Jeff's)
 
We have a value for Mike, so let's plug it in:
18 = 2j - 4
 
All you need to do from here is isolate j. Start by adding 4 to both sides:
18 + 4 = 2j - 4 + 4
22 = 2j
Divide by 2:
22 / 2 = 2j / 2
11 = j