u( t - 2s)
double s is expressed as 2s
subtract this result from t gives t - 2s
multiply this result by u gives u × (t - 2s) = u( t - 2s)
The answer would be 4 after dividing both sides by 8.
The correct answer is two or four
That would be written as:

And the step-by-step equation would be:
→ we take the 2 to the right side of the equation and do the IO*
→we solve for 
→ final answer
*Ps - IO is not an existing term and stands for inverse operation. In this case, because when we take to 2 to the right side of the equation (the 2 is a power) it'll have to turn into a square root (because exponents and roots are inverse operations)
Hope it helped,
BioTeacher101