Ответ :

-1(logx(5)-(1/2)logx(12)+1/2(logx(3))=1

-1(logx(5)-1/2(logx(12)-logx(3))=1

-1(logx(5)-1/2(logx(4)=1

-2logx(5)-logx(4)=2

-(logx(5^2)+ logx(4))=2

logx(100)=-2

x=0.1

!!!