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3^2x-5=7.5
We move all terms to the left:
3^2x-5-(7.5)=0
We add all the numbers together, and all the variables
3^2x-12.5=0
We move all terms containing x to the left, all other terms to the right
3^2x=12.5
x=12.5/1
x=12.5
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