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8 + 12x = 15x - 19
8 + 19 = 15x - 12
27 = 3x
27 : 3 = x
9 = x
Comprobamos:
8 + 12x = 15x - 19
8 + 12 . 9 = 15 . 9 - 19
8 + 108 = 135 - 19
116 = 116
- Segunda ecuación:
5x - 1 = 9
5x = 9 + 1
5x = 10
x = 10 : 5
x = 2
Comprobamos:
5x - 1 = 9
5 . 2 - 1 = 9
10 - 1 = 9
- Tercera ecuación:
5x + 6 = 21
5x = 21 - 6
5x = 15
x = 15 : 5
x = 3
Comprobamos:
5x + 6 = 21
5 . 3 + 6 = 21
15 + 6 = 21
21 = 21
- Cuarta ecuación:
2x + 4 = 6
2x = 6 - 4
2x = 2
x = 2 : 2
x = 1
Comprobamos:
2x + 4 = 6
2 . 1 + 4 = 6
2 + 4 = 6
6 = 6
- Quinta ecuación:
2x + 4 = 0
2x = 0 - 4
2x = -4
x = -4 : 2
x = - 2
Comprobamos:
2x + 4 = 0
2 . (-2) + 4 = 0
-4 + 4 = 0
0 = 0
- Sexta ecuación:
x - 5 = 5
x = 5 + 5
x = 10
Comprobamos:
x - 5 = 5
10 - 5 = 5
5 = 5
- Séptima ecuación:
6x + 3 = 5x
6x = 5x - 3
6x - 5x = -3
x = - 3
Comprobamos:
6x + 3 = 5x
6 . (-3) + 3 = 5 . (-3)
-18 + 3 = - 15
-15 = -15
- Octava ecuación:
5x + 6 = 7x
6 = 7x - 5x
6 = 2x
6 : 2 = x
3 = x
Comprobamos:
5x + 6 = 7x
5 . 3 + 6 = 7 . 3
15 + 6 = 21
21 = 21
- Novena ecuación:
3x - 8 = 6 - 4x
3x + 4x = 6 + 8
7x = 14
x = 14 : 7
x = 2
Comprobamos:
3x - 8 = 6 - 4x
3 . 2 - 8 = 6 - 4 . 2
6 - 8 = 6 - 8
-2 = - 2
- Décima ecuación:
14 + x = 26
x = 26 - 14
x = 12
Comprobamos:
14 + x = 26
14 + 12 = 26
26 = 26