Question

Qual é a raiz das equações a seguir:
a) -2x= - 4+3x
b)7x -2 = - 4x +5
c) 2x -6 = -x+15
d)2(x-3) - 4x= -3x-8
e)9-3(2x-8) +2(4-5x)=20-(5+2x)
f)50x + 200= 20(x-4)+100
g)3x+ 26= -1
h)4x -8-2x= x-2
i) 10x-8-2=7x-4

Answer 1

a) -2x= - 4+3x
    -2x - 3x = -4
    -5x = -4
       x = 4/5

b)7x -2 = - 4x +5
    7x + 4x = 5 + 2
     11x = 7
         x = 7/11

c) 2x -6 = -x+15
    2x + x = 15 + 6
    3x = 21
      x = 7

d)2(x-3) - 4x= -3x-8
    2x - 6 - 4x = -3x - 8
    2x - 4x + 3x = -8 + 6
    x = -2

e)9-3(2x-8) +2(4-5x)=20-(5+2x)
    9 - 6x + 24 + 8 - 10x = 20 - 5 - 2x
     -6x - 10x + 2x = 20 - 5 - 9 - 8
     -14x = -2
          x = 1/7

f)50x + 200= 20(x-4)+100
   50x + 200 = 20x - 80 + 100
   50x - 20x = -80 + 100 - 200
   30x = -80
       x = -8/3

g)3x+ 26= -1
   3x = -1 - 26
   3x = -27
     x = -9

h)4x -8-2x= x-2
    4x - 2x - x = -2 + 8
    x = 6

i) 10x-8-2=7x-4
    10x - 7x = -4 + 8 + 2
     3x = 6
       x = 2