Question

1)resolva as equações:         b)x-25=19-3x         c)8-7x=14-10x       d)6(25-x)+20=-15x+242

Answer 1

Letra b : 

x-25=19-3x   
x + 3x = 19 + 25
4x = 44
x = 44 / 4
x = 11

Letra c :

8-7x=14-10x    
-7x + 10x = 14 - 8
3x = 6
x = 6 / 3
x = 2

Letra d : 

6(25-x)+20=-15x+242
150 - 6x + 20 = -15x + 242
-6x + 15x = 242 - 150 - 20
9x = 72
x = 72 / 9
x = 8

Answer 2

  b)x-25=19-3x
x + 3x = 19 + 25
4x = 44
x = 44/4
x = 11

S[11]


c)8-7x=14-10x 
-7x + 10x = 14 - 8
3x = 6
x = 6/3
x = 2

S[2]


  d)6(25-x)+20=-15x+242
150 -6x + 20 = - 15x + 242
- 6x + 15x = 242 - 150 - 20
9x = 242 - 170
9x = 72
x = 72/9
x = 8

S[8]