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1-12.3^x+27.3^2x
terus dimisal 3^x=y
jadinya 27y^2-12y+1=0
(9y-1)(3y-1)=0
y=1/9 atau y=1/3
3^x=1/9 atau 3^x=1/3
x1= -2 , x2= -1
x1^2+x2^2= (-2)^2+(-1)^2=4+1=5