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b=4
1/2.³log(a+b)²=1
1/2.³log(a+4)²=1
³log (a²+16+8a)=2=³log9
a²+16+8a=9
a²+16+8a-9=0
a²+8a+7=0
(a+1)(a+7)
a=-1
a=-7