Find three numbers if their sum is 53.5 and the first number is 3 times less than the second

Find three numbers if their sum is 53.5 and the first number is 3 times less than the second, and the third number is 6 less than the second.

Let x be the first number, then 3x is the second number, then 3x-6 is the third number
Sum of all numbers 53.5
The equation:
x + 3x + (3x-6) = 53.5
x + 3x + 3x-6 = 53.5
7x-6 = 53.5
7x = 59.5
x = 8.5
8.5 is the first number, then 3 * 8.5 = 25.5 is the second number, then
25.5-6 = 19.5 is the third number
Answer: these are numbers 8.5; 25.5; 19.5.