Hasil dari |2y + 5| = |8 – 4y |

F(x) = a
I2y + 5I = I8 – 4yI
2y + 5 = 8 – 4y
2y + 4y = 8 – 5
6y = 3
y = 3/6
y = -1/2

atau

f(x) = -a
I2y + 5I = -I8 – 4yI
2y + 5 = -8 + 4y
2y – 4y = -8 -5
-2y = -13
y = 13/2