10n + 9 = 12 + 7n
10n – 7n = 12 – 9
3n = 3
n = 1
7x = 2x + 10
7x – 2x = 10
5x = 10
x = 2
5x + 1 = 4x + 2
5x – 4x = 2 – 1
x = 1
6x – 6 = 4x + 8
6x – 4x = 8 + 6
2x = 14
x = 7
10y + 6 = 27 + 3y
10y – 3y = 27 – 6
7y = 21
y = 3
7x – 10 = 3x – 6
7x – 3x = – 6 + 10
4x = 4
10n + 9 = 12 + 7n
10n – 7n = 12 – 9
3n = 3
n = 1
7x = 2x + 10
7x – 2x = 10
5x = 10
x = 2
5x + 1 = 4x + 2
5x – 4x = 2 – 1
x = 1
6x – 6 = 4x + 8
6x – 4x = 8 + 6
2x = 14
x = 7
10y + 6 = 27 + 3y
10y – 3y = 27 – 6
7y = 21
y = 3
7x – 10 = 3x – 6
7x – 3x = – 6 + 10
4x = 4
x = 1