Question

Solve for x: |2x + 6| − 4 = 20

Answer 1

|2x + 6| − 4 = 20
|2x + 6|=24
|2x|=18
|x|=9
x=+9,-9

Answer 2

for positive charge we can write
2x+6-4=20
=>2x+2=20
=>2x=20-2
=>x=18/2
=>x=9
for negative charge we can write
-(2x+6)-4=20
=>-2x-6-4=20
=>-2x-10=20
=>-2x=20+10
=>-2x=30
=>x=-15