If 2+2=6, then......................?

This is in sequel to the previous blog.
We called in the previous blog the result of the operation 2+2 as 6. or 2+2=6
So we could say that 2x2=6 and so on.
In the final step we got 6x2=18; but how?
6x2=2x6=2+2+2+2+2+2= 6+6+6=18;

Now if 2+2=6 then is 6+6 equal to 12 or 6+6+6=18?
Actually i do not know the answer. I feel that 6+6 will not be 12 if 2+2 is not equal to 4.
Lets take another case; if 2+2=6; then what is 2x7?
2x7=2+2+2+2+2+2+2= 6+6+6+2 (is it correct?)
Even if it is correct; what is 6+2? or 18+2.

Of course, if i change the convention and call 2+2=parrot, then all the above calculations will be redundant, rather...............

This is where my basics of mathematics or logic stands. If the simple convention of 2+2=4 is changed to 2+2=6 ; i do not know how to complete the derivation of other operations like 2+4 or 2x6 or 2x7 or 18+2. Yet i call myself an engineer. Its unfortunate, but that is how we are thought and this is how i learnt.
We are thought that 2+2=4; neither we questioned nor anybody explained why 2+2=4?