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Let be the three numbers. We know that the first number is 7 more than the third, which means
Also, we know that the second number is 2 times the third, which means
Finally, we know that the three numbers sum up to 75, but we can rewrite the sum in terms of the third numbers, because the two previous equations gave us a way to express and
in terms of
:
Now, we can use those same equations to deduce the other two numbers: