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The documentation shows many examples with two variables, but in fact there is no restriction on the number of variables or constraints. Example with three variables and three constraints:

A = ([1, 1, 0], [3, 1, 0], [0, 0, 1])
b = (1000, 1500, 20)
c = (10, 5, 1)
P = InteractiveLPProblem(A, b, c, ["C", "B", "A"], variable_type=">=")
show(P)
P = P.standard_form()
P.run_simplex_method()

Three variables and two constraints:

A = ([1, 1, 0], [3, 1, 0])
b = (1000, 1500)
c = (10, 5, 1)
P = InteractiveLPProblem(A, b, c, ["C", "B", "A"], variable_type=">=")
show(P)
P = P.standard_form()
P.run_simplex_method()

Etc.