Question

128-3.(x+4)=23

Answer 1

128 - 3 ( x + 4 ) = 23

  3( x + 4 ) = 128 - 23 = 105

 x + 4        = 105 : 3 = 35

   x            = 35 - 4 = 31

Answer 2

128-3.(x+4)=23

=> 3.(x+4)=128-23

=> 3.(x+4)=105

=> x+4=105:3

=> x+4=35

=> x=35-4

=> x=31