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3^(x+2)-3^x=8/27
We move all terms to the left:
3^(x+2)-3^x-(8/27)=0
We add all the numbers together, and all the variables
3^(x+2)-3^x-(+8/27)=0
We get rid of parentheses
3^(x+2)-3^x-8/27=0
We multiply all the terms by the denominator
(3^(x+2))*27-3^x*27-8=0
Wy multiply elements
(3^(x+2))*27-81x-8=0
We add all the numbers together, and all the variables
-81x+(3^(x+2))*27-8=0
We move all terms containing x to the left, all other terms to the right
-81x+(3^(x+2))*27=8
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