To solve the equation, first distribute the 48 to each term inside the parentheses:

3(48) + 4/5(48) - 25 = 1 1/2

This simplifies to:

144 + 38.4 - 25 = 1 1/2

Combine like terms:

157.4 - 25 = 1 1/2

132.4 = 3/2

To solve for x, we need to isolate it on one side of the equation. First, convert 1 1/2 to an improper fraction:

1 1/2 = 3/2

Now, add 25 to both sides of the equation:

132.4 + 25 = 3/2

157.4 = 3/2

Multiply both sides of the equation by 2 to get rid of the fraction:

157.4 * 2 = 3

314.8 = 3

Divide both sides by 3 to solve for x:

x = 314.8 / 3

x = 104.9333

Therefore, the solution to the equation is x = 104.9333.