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