ById("button_1").disabled){
            var eq = eval("solver_1_eq_" + solver_1_eq_temp_id);
            var x = client_to_x(client_x);
            var y = client_to_y(client_y);            
            var temp_eq = new_equation_for_one_point(eq[0], eq[1], eq[2], x, y);
            eval("solver_1_eq_" + solver_1_eq_temp_id + "_temp = Array.from(temp_eq);");
            
            context.beginPath();
            var xys = get_points_on_the_ends(temp_eq[0], temp_eq[1], temp_eq[2]);
            context.mov