Respostas

2013-12-11T19:48:58-02:00
A)
3x + 3 + 2 = 5 + 2x - 2
3x + 5 = 3 + 2x
3x - 2x = 3 - 5
x = -2

b)

 \frac{x-1}{2} +  \frac{x+1}{3}  =  \frac{2x+3}{5}

15x - 15 + 10x + 10 -12x + 18 =
13x + 13 =

x =  \frac{-13}{13}

x= -1

c)

 \frac{1-x}{2}  =  \frac{x+1+x}{2}

 \frac{1-x}{2} =  \frac{2x+1}{2}

2 - 2x = 4x + 2
4x + 2 = 2 - 2x
6x = 2 - 2

x =  \frac{0}{6}

x = 0