Given: line uv bisects line wz at v. draw the diagram and find the measure of line wz if
vz=4a+3 and vw+15-2a

If WZ is bisected, then VZ = VW. So, set the two equations equal to each other: 4a+3 = 15-2a.
1) Add 2a to both sides: 6a+3 = 15
2) Subtract 3 from both sides: 6a = 12
3) Divide both sides by 6 to find a: a = 2.

1.17+3.99a. you combine the terms with a to create 3.99 and the 1.17 stays because it has no like terms or a variable