3x+1. 3+x 3x + 1 + 3 + x 4x + 4 4(x + 1)
------- + --------- = ----------------------- = ------------ = --------------- = 4
x+1. x+1 x + 1 x + 1 x + 1
------------------------------------------------------------------------------------------------------
3x. x+8 3x x + 8 3x - x - 8 2x - 8 2(x - 4)
------ + ------- = ---------- - ----------- = --------------- = ------------ = ------------ = 2
x-4. 4-x x - 4 x - 4 x - 4 x - 4 x - 4
--------------------------------------------------------------------------------------------------
5x+1. 6 5x + 1 - 6 5x - 5 5(x - 1)
------- - ------ = ----------------- = ------------- = --------------- = 5
x-1. x-1 x - 1 x - 1 x - 1