Answer: x = 4
Step-by-step explanation: f(2) = 3(2)-1 = 5. Meaning x needs to be a value that makes g(x) = 5. You can set them up equal to each other 5 = 2x-3 and solve. You end up getting x = 4.
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If the pre-image is dilated, the image must be congruent to the pre-image.
The definition is pretty simple:

So, we only have to sum the expressions:

you showed no diagram or any picture / screenshot