1.
x = 12 + 4
x = 16
2.
9x = 14 + 4
9x = 18
x = 18/9
x = 2
3.
x = - 4/3
4.
(-) -2x = - 14
2x = 14
x = 14/2
x = 7
5.
11x + 5x = 121 - 9
16x = 112
x = 112/16
x = 7
6.
11x + 9x = 37 + 3
20x = 40
x = 40/20
x = 2
7.
3x + 4x = - 21 - 7
7x = - 28
x = - 28/7
x = - 4
8.
-7x - 10x = 80 + 5
(-) -17x = 85
x = -85/17
x = - 5
9.
-3x - 2x = - 26 - 9
(-) -5x = -35
x = 35/5
x = 7
10.
9x = 4 - 2 + 2
9x = 4
x = 4/9
Espero haberte ayudado. Suerte en los estudios ≧◠◡◠≦.
