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log (2a-b)=1
log (2a-b)=log 10
2a-b=10 (i)
baris kedua, kolom pertama
log (b-2)=log a
b-2=a
-a+b=2 (ii)
eliminasi salah satu variabel
2a-b=10
-a+b=2
_______+
a=12
-a+b=2 (ii)
-12+b=2
b=14
maka nilai a=12 b=14