The too many uses of the five- bar mechanism and the seven-bar one in novel mechanical systems, lead us to develop the action of the both mechanisms. Compacting the both mechanisms gives ability new mechanism with dual action. It is that the new one is better in achieving but It's more difficult in studying from the to separately. The developing of the action appears in decreasing the maintenance and having the same goal with low weight and no friction. The experiment refers that using flexural hinges in a system at least leads to all of that advantages. We have a plane mechanical system consisted of five bar mechanism and seven bar mechanism, with revolute joints. Then, we replace each revolute joint with super elastic hinge. In this way, we have a gate to build a system,strongly recommended, to achieve the same goal using minimum energy. The main purpose of this paper is to elaborate a mathematical mechanism able to estimate the deviations of the considered system before and after replacing revolute hinges, taking into account the real performance of the novel system through additional large extra displacements in the flexural hinges.