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a=9-b
2a+8b=36
2(9-b) + 8b = 36
18-2b+8b=36
6b=18
b=3
a=9-b
a=9-3
a=6
u9=a+8b
=6+8(3)
=6+24
=30
2) ar=4, ar^4=32
r^3=8
r=2
ar=4
2a=4
a=2
u8=ar^7
=2.2^7
=64