Question

3 x + 2 x - 7 = 3 + x

Answer 1

3x + 2x - 7 = 3 + x
5x - 7 = 3 + x
5x - x = 3 + 7
4x = 10
x = 10 (:2)       5
      ----        =  ----  =  2,5
       4  (:2)        2

x = 5/2  ou 2,5

Answer 2

3x+2x-7=3+x
5x-7=3-x
4x=10
x=2,5