CVXPY
Minimize
  abs(x + y)
Subject To
Bounds
 x free
 y free
End
----------------------------------------
AFTER COMPILATION
Minimize
  x_0
Subject To
 R0: - x_0 + x_1 + x_2 <= 0
 R1: - x_0 - x_1 - x_2 <= 0
Bounds
 x_0 free
 x_1 free
 x_2 free
End
----------------------------------------
GUROBI
Minimize
  abs_2
Subject To
 R0: - x - y + AddExpression_1 = 0
Bounds
 x free
 y free
 AddExpression_1 free
General Constraints
 GC0: abs_2 = ABS ( AddExpression_1 )
End