Using the cross product property on this proportion gives us the following equation:
6 (3x + 3) = 7 (x + 16)
Use the distributive property
18x + 18 = 7x + 112
Subtract both sides by 7x
11x + 18 = 112
Subtract both sides by 18
11x = 94
Divide both sides by 11
x = 94/11
This fraction is already fully simplified and cannot be simplified further. This should be your answer.
Let me know if you need any clarifications, thanks!