Respuesta :
Answer: x=5
Step-by-step explanation: multiple both sides by 2
3 + x =8
X = 8-3
=5
1/2(3 + x) = 4
1/2•3 + 1/2•x = 4
3/2 + x/2 = 4
x/2 = 4 - 3/2
x/2 = 5/2
so x = 5
1/2•3 + 1/2•x = 4
3/2 + x/2 = 4
x/2 = 4 - 3/2
x/2 = 5/2
so x = 5