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2.8^(2x+1)x9.4^(2x-1)=6.3^(4x)
We move all terms to the left:
2.8^(2x+1)x9.4^(2x-1)-(6.3^(4x))=0
We get rid of parentheses
2.8^(2x+1)x9.4^(2x-1)-6.3^4x=0
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