Question

Resolva as equações:
a) 2x + 11 = x

b) 3x + 1 = 2x

c) 1 + 2x = 3 - 5x

d) 5x - 1 = 2 - x


Urgente, esqueci como faz!

Answer 1

a)
2x + 11 = x
2x - x = - 11
x = -11

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b)
3x + 1 = 2x
3x - 2x = - 1
x = - 1

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c)
1 + 2x = 3 - 5x 
2x + 5x = 3 - 1
7x = 2
x = 2/7

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d)
5x - 1 = 2 - x 
5x + x = 2 + 1
6x = 3
x =   3  (:3)
      -----
        6  (:3)

x = 1/2

Answer 2

a) 2x + 11 = x
2x-x= -11
x= -11

b) 3x + 1 = 2x
3x-2x= -1
x= -1

c) 1 + 2x = 3 - 5x
2x+5x= 3-1
7x= 2
x=2/7

d) 5x - 1 = 2 - x
5x+x= 2+1
6x= 3
x= 3/6
x= 1/2