8u+3=5u+7.5

Sure, let's solve the equation step by step:

1. First, we need to get all the terms with 'u' on one side of the equation and the constants on the other side. We can do this by subtracting '5u' from both sides of the equation:

   8u - 5u = 7.5 - 3

2. This simplifies to:

   3u = 4.5

3. Finally, to solve for 'u', we divide both sides of the equation by 3:

   u = 4.5 / 3

4. So, the solution to the equation is:

   u = 1.5