Resposta :
a) x + 1 = 5, sendo U = N
x = 5 - 1
x = 4
S = {4}
b) 2x = - 4, sendo U = Z
x = - 4/2
x = - 2
S = {-2}
c) 5 + x = - 4, sendo U = Z
5 + x + 4 = 0
9 + x = 0
x = - 9
S = {-9}
a) x + 1 = 5, sendo U = N
x = 5 - 1
x = 4
S = {4}
b) 2x = - 4, sendo U = Z
x = - 4/2
x = - 2
S = {-2}
c) 5 + x = - 4, sendo U = Z
5 + x + 4 = 0
9 + x = 0
x = - 9
S = {-9}