A - 5x = 25 x = - 25 / 5 x = - 5
Comprobación : - 5.
- 5 = 25 25 = 25
b - 2x = - 234 x = 234 / 2 x = 117
Comprobación : - 2.
117 = - 234 - 234 = - 234
c - 120 = x.
8 - 120 / 8 = x - 15 = x
Comprobación : - 120 = - 15.
8 - 120 = - 120
d - 24x = - 96 x = 96 / 24 x = 4
Comprobación : - 24.
4 = - 96 - 96 = - 96
e 68x = - 204 x = - 204 / 68 x = - 3
Comprobación :
68.
- 3 = - 204 - 204 = - 204
f - 5x = - 9x - 24 - 5x + 9x = - 24 4x = - 24 x = - 24 / 4 x = - 6
Comprobación : - 5.
- 6 = - 9.
- 6 - 24
30 = 54 - 24
30 = 30
5 + 2x = 5x - 7
2x - 5x = - 7 - 5 - 3x = - 12 x = 12 / 3 x = 4
Comprobación :
5 + 2.
4 = 5.
4 - 7
5 + 8 = 20 - 7
13 = 13
h 1 + 4x - 3 = 6x + 8 4x - 6x = 8 - 1 + 3 - 2x = 10 x = - 10 / 2 x = - 5
Comprobación :
1 + 4.
( - 5) - 3 = 6.
( - 5) + 8
1 + ( - 20) - 3 = - 30 + 8
1 - 20 - 3 = - 30 + 8 - 22 = - 22
i 25x = 120 - 5x + 10x 25x + 5x - 10x = 120 20x = 120 x = 120 / 20 x = 6
Comprobación :
25.
6 = 120 - 5.
6 + 10.
6
150 = 120 - 30 + 60
150 = 150
j 8 .
(x - 2) = 4.
(x + 3) 8 x - 16 = 4x + 12 8x - 4x = 12 + 16 4x = 28 x = 28 / 4 x = 7
Comprobación :
8(7 - 2) = 4(7 + 3) 8.
5 = 4.
10 40 = 40.