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# EplexInstance:(?X =:= ?Y)

Constrains X to be equal to Y.
*X*
- Linear expression
*Y*
- Linear expression

## Description

Logically: Constrains X to be equal to Y.
X and Y are linear expressions.
Operationally, the constraint gets delayed until the external
solver state for EplexInstance is invoked.
## See Also

=:= / 2, iso_light : =:= / 2, suspend : =:= / 2, iso_strict : =:= / 2, ic : =:= / 2, =< / 2, >= / 2, $>= / 2, $= / 2, $=< / 2, eplex_solver_setup / 1, eplex_solver_setup / 4, eplex_probe / 2, eplex_solve / 1, eplex_get / 2, eplex_var_get / 3, eplex_cleanup / 0