Question

3x-5=7-x by trail and error method

Answer 1

1. if x=1
   3(1)-5=7-(1)
   -2≠6
   ∴x≠1

2. if x=2
   3(2)-5=7-(2)
   1≠5
   ∴x≠2

3. if x=3
    3(3)-5=7-(3)
    4=4

∴ x=3

Answer 2

3x-5=7-x
=3x+x=5+7
=4x=12
=x=12/4
=x=3