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Así que el enunciado para resolver es :
Resolver las siguientes ecuaciones de primer grado.
Cuál es el valor de la variable x en cada ecuación?
14 = x + 2
- x = 2 - 14
- x = - 12
x = 12
-------------------------------
17 - x = 14
- x = 14 - 17
- x = - 3
x = 3
------------------------------
x - 8 = - 2
x = - 2 + 8
x = 6
----------------------------
35 = 5x
35/5 = x
7 = x
----------------------------------
x/2 + 1 = 6
x/2 = 6 - 1
x/2 = 5
x = 5 * 2
x = 10
------------------------------------
2x + 5x = 21
7x = 21
x = 21/7
x = 3