7x + 8 = 11
7x = 11 - 8
7x = 3
x = 3/7
4x + 4 = x + 5
4x - x = 5 - 4
3x = 1
x = 1/3
8x - (7x + 8) = 9
8x - 7x - 8 = 9
x = 9 + 8
x = 17
4 + 8y + 8 = 2y - (10 + 7y) + 9
4 + 8y + 8 = 2y - 10 - 7y + 9
8y - 2y + 7y = -10 + 9 - 4 - 8
13y = -13
y = -13 : 13
y = -1
7x + 8 = 11
7x = 11 - 8
7x = 3
x = 3/7
4x + 4 = x + 5
4x - x = 5 - 4
3x = 1
x = 1/3
8x - (7x + 8) = 9
8x - 7x - 8 = 9
x = 9 + 8
x = 17
4 + 8y + 8 = 2y - (10 + 7y) + 9
4 + 8y + 8 = 2y - 10 - 7y + 9
8y - 2y + 7y = -10 + 9 - 4 - 8
13y = -13
y = -13 : 13
y = -1