Question

the difference between twise a number and 3 is 15 (use x for the unknown number )

Answer 1

Let the number be x.
Then, 2*x - 3 = 15
2x=15+3
2x = 18
x = 18/2
x = 9.
Therefore, the number is 9.
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Answer 2

2x - 3 =15
=>2x = 18
=> x = 18/2 = 9