1) 4^(5-x)=4^3
5-x=3
x=2
2) 5^(3x-12)=5^3
3x-12=3
x=5
3) 5^(4-x)=5^3
4-x=3
x=1
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Verified answer
1) 4^(5-x)=4^3
5-x=3
x=2
2) 5^(3x-12)=5^3
3x-12=3
x=5
3) 5^(4-x)=5^3
4-x=3
x=1