Without knowing what the functions are, you have to leave it as a sum. For example, f(x)+g(x) is as far as you can get, if you don't know what f(x) or g(x) are.
If you are told f(x)=x+5, and g(x)=2x-1, you can plug in to get x+5+2x-1, which just equals 3x+4.
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To calculate two-thirds of a sum, you first find the sum of the numbers. Then, you multiply the sum by 2/3, which is the same as multiplying the sum by 2 and dividing by 3. This will give you the result of two-thirds of the sum. For example, if the sum is 15, two-thirds of the sum would be (15 x 2) / 3 = 10.
How about: 18 and 24
224, 225
2 and 15 5 and 12
Three and Seven