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we have the sequence
10,20,18,36,34,...
we have that
a1=10
a2=20
so
a2=2*a1
a3=18
a3=a2-2
a4=36
a4=2a3
a5=34
a5=a4-2
then
a6=2a5 -----> 2*34=68
a7=a6-2=68-2=66