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
128 - 3(x + 4) = 23
3(x + 4) = 105
x + 4 = 35
x = 31
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
128 - 3(x+4)=23
<=>3(x+4)=128-23
<=>3(x+4)=105
<=>x+4=35
<=>x=31
28-3(x+4)=23
3(x+4)=5
x+4=5/3
x=5/3-4/1
x=-7/3