7. Determine the mass and composition of the equilibrium phases in the state indicated by the dot on the boiling diaphragm of the two-component system A-B, if the total mass of these substances is 200 g. This state diagram was built at an external pressure of 1 atm.

When performing this task, explain the essence and meaning of the so-called "rule of leverage", on which the solution of the task is based. In addition, when solving a task, it is imperative to pay attention to the fact that this rule makes it possible to calculate the quantities of phases in equilibrium, and not substances.

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