Hard Logical Problem with Answer

Here is the logical reasoning problem which will twist your brain. Here some logical equations are given which have some logical pattern. Do find this pattern and then solve the last equation.

Can you solve this hard logical problem?

Answer of this hard logical problem, can be viewed by clicking on button. Please do give your best try before looking at the answer.

The Answer is 51. Double the number of left side and then subtract 3 to get the number on right hand side.

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