it means multiplying the original number by two and then subtracting two, like if your original number was 10, 10 times two equals 20 minus 4 equals 16.
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you r asking a number whose twice will be 4 but less than 8. so, take a no. x. by ques. 2x=4; 2x=4; x=4/2; hence x=2; 2 is answer and less than 8 of twice it.
Factors of 28 include 7 x 4. 7 is 1 less than twice 4...
2n-4
10
l - 4 = 2w