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9^1-3x=81^1-x
We move all terms to the left:
9^1-3x-(81^1-x)=0
We add all the numbers together, and all the variables
-3x-(81^1-x)+9=0
We get rid of parentheses
-3x+x+9-81^1=0
We add all the numbers together, and all the variables
-2x-72=0
We move all terms containing x to the left, all other terms to the right
-2x=72
x=72/-2
x=-36
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