Question

how do yousolvefor x in /3x/=9?

Answer 1

the lines around the 3x mean the absolute value of 3x
- this means if x ia positive or negative , the positive value is taken
so we can write 3x = 9 or -3x = 9

so x = 3 or -3

the solution set is {3 , -3}

Answer 2

so the answer for /-4/=x would be x=4 or -4?

Answer 3

4