Respostas

  • Usuário do Brainly
2014-07-29T15:00:02-03:00
A)
5+2x=25
2x=25-5
2x=20
x=20÷2
x=10
S={10}

b)
25-5=2x
-2x=-25+5
-2x=-20
2x=20
x=20÷2
x=10
S={10}

c)
20=2x
2x=20
x=20÷2
x=10
S={10}

d)
20/2=x
x=10
S={10}

e)
10=x
x=10
S={10}
1 3 1