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a)
6x + 1 - 2x = 2x + 17
6x - 2x + 1 = 2x + 17
4x + 1 = 2x + 17
4x - 2x = 17 - 1
2x = 16
x = 16/2
x = 8
..........................................................................
b)
15x + 4 = 6x - 86 - x
15x + 4 = 6x - x - 86
15x + 4 = 5x - 86
15x - 5x = - 86 - 4
10x = - 90
x = - 90/10
x = - 9
.................................................................
c)
9x + 33 - 4x = 9x - 7
9x - 4x + 33 = 9x - 7
5x + 33 = 9x - 7
33 + 7 = 9x - 5x
40 = 4x
40/4 = x
10 = x
.................................................................
d)
5 = 7x + 26 + 2x - 12x
5 = 7x + 2x - 12x + 26
5 = - 3x + 26
- 3x = 26 - 5
- 3x = 21
La variable "x" tiene que estar despejada con signo positivo.
3x = - 21
x = - 21/3
x = 7