Respostas

  • Usuário do Brainly
2014-08-07T16:00:46-03:00
A)
2x+3(x-2)=7x+34
2x+3x-6=7x+34
2x+3x-7x=34+6
-2x=40
2x=-40
x=-40÷2
x=-20
S={-20}

b)
4(x-2)=4+2(x+1)
4x-8=4+2x+2
4x-2x=4+2+8
2x=14
x=14÷2
x=7
S={7}

c)
2(-x+1)+1=3
-2x+2+1+3
-2x=3-2-1
-2x=0
x=0
S={0}

d)
1,8x-3(0,2x+1)=0,6(x-2)
1,8x-0,6-3=0,6x-1,2
1,8x-0,6x-0,6x=-1,2+3
0,6x=1,8
x=1,8÷0,6
x=3
S={3}