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Question
The sum of twice a number and 4 is 18.
Solution
Let the number be x.
Then, sum of twice of a number and 4 gives the result 18.
Hence, 2x + 4 = 18 is the equation.
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For riddle answer: substitute the number for the letter it equals
`()/1 ()/2 / ()/3 ()/4 ()/5 ()/6 ()/7 ()/8/()/4 ()/9`
