1. Multiply out .05 to each term in the parenthesis.
.05x + .2 + .10x = 1.25
2. Add the like terms together.
.15x + 4 = 1.25
3. Subtract both sides by 4 to make .15x by itself
.15x = -2.75
4. divide both sides by .15 to make x by itself
x = -55 / 3 or -18.333333333333333333333334 (repeating) or -18 1/3