Question

resolva as equacoes.
a)x+5=12-2x
b)5x=20
c)2x-1=x+5
d)2(x+6)=4(x+2)

Answer 1

A) x+5=12-2x
x+2x=12-5
3x=7
x=7/3

B)(5x=20
x=20/5
x=4

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

D2x+12=4x+8
  2x-4x=8-12 (.-1)
  -2x+4x= -8+12
   2x= 4
   x=4/2
   x=2

Answer 2

a)  x + 2x = 12 - 5 
    3x = 7
    x = 7\3
    
b)  x = 20\5
     x = 4
 
c) 2x - x = 5 + 1 
    x = 6

d) 2x + 12 = 4x + 8
    2x - 4x = 8 - 12 
    - 2x = - 4
       x = -4\-2 
       x = 2