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(25/9)^-3x=3125/243
We move all terms to the left:
(25/9)^-3x-(3125/243)=0
We add all the numbers together, and all the variables
-3x+(+25/9)^-(+3125/243)=0
We get rid of parentheses
-3x+(+25/9)^-3125/243=0
We calculate fractions
-3x+()/()+()/()=0
We add all the numbers together, and all the variables
-3x+2=0
We move all terms containing x to the left, all other terms to the right
-3x=-2
x=-2/-3
x=2/3
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