Find the value of x for each of the special parallelograms.
5. rhombus

The two angles given are supplementary angles so when added together need to equal 180 degrees.
2x-1 + 4x+28 = 180
Simplify:
6x +27 = 180
Subtract 27 from both sides:
6x = 153
Divide both sides by 6:
x = 25.5