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8y + 12 - 2y = 12y + 9
6y + 12 = 12y + 9
- 6y = - 3
y = 1/2
y + 5 = 11/2
8y + 12 - 2y = 12y + 9
8y - 2y - 12y = 9 - 12
6y - 12y = -3
-6y = -3
y = 1/2
y + 5 = 1/2 + 5
= 1/2 + 10/2
=11/2 -> 5 1/2