Answer and Explanation:
Problem 1:
4x - 12 = 16
4x = 28
x = 28 / 4
x = 7, G
Problem 2:
5x + 10 = - 25
5x = - 35
x = - 35 / 5
x = -7, C
Problem 3:
x / 2 + 11 = 12
x / 2 = 12 - 11 = 1
x = 2 * 1
x = 2, H
Problem 4:
7.5 * x + 10 = -5
x = -2, E
(Not sure about this one)
Code: GCHE