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g(x)=5x+4
f0g(x)=6x-3
f0g(x)=6(5x+4)-3
f09(x)=30x+24-3
f0g(x)=30x+21
f0g(a)=81
⇒30(a)+21=81
⇒30a=60
⇒a=60/30
a=2
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