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1/4x = - 1/4y - 1
1/4 ( x + y ) = - 1. /•4
x + y = - 4
- 1/4x - 3 = 1/4y - 1/2y
- 1/4x - 3 = - 1/4y
1/4 ( -x + y ) = 3. /•4
-x + y = 12