The equation is .

According to addition property of equality: if a = b, then a + c = b + c.

    (Add 25.2 to each side)

         (Additive inverse property: )

                        (Add: 26.8 + 25.2 = 52)

According to Subtract property of equality: if a = b, then a c = b c.

   (Subtract 3.8t from each side)

    (Commutative property: a + b = b + a)

                          (Additive inverse property: )

                                     (Subtract: )

According to Means-extremes Property of proportion: If ,

then ad = bc.

                          (Divide each side by 10.4)

                                    (Cancel common terms)

                                             (Divide: )

Check:

To check the solution, substitute in original equation.

                  (Multiply: )

                          (Add: 19 + 26.8 = 45.8)

                                  (Subtract: )

Here the solution is true.

The value of the expression is .