Function SCIPdelCoefExactLinear 

pub unsafe extern "C" fn SCIPdelCoefExactLinear(
    scip: *mut SCIP,
    cons: *mut SCIP_CONS,
    var: *mut SCIP_VAR,
) -> SCIP_RETCODE

deletes variable from linear constraint

@note This method may only be called during problem creation stage for an original constraint and variable.

@note This method requires linear time to search for occurences of the variable in the constraint data.