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=5^a×5^b.2^b×5^c.3^c=72
=5^(a+b+c)×2^b×3^c=2^3.3^2
=5^(a+b+c)=0
=2^b=2^3
=3^c=3^2
b=3,c=2,a=-5
a+2b+3c=-5+2.3+3.2
=-5+6+6=11
ferry rozak
maaf kelamaan.