Substract a scalar affine function and a scalar quadratic term
1 2 3  | ## S4 method for signature 
## 'MOI_scalar_quadratic_term,MOI_scalar_affine_function'
e1 - e2
 | 
e1 | 
 A scalar quadratic term  | 
e2 | 
 A scalar affine function  | 
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