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2^x-6=2x+15
We move all terms to the left:
2^x-6-(2x+15)=0
We get rid of parentheses
2^x-2x-15-6=0
We add all the numbers together, and all the variables
-2x+2^x-21=0
We move all terms containing x to the left, all other terms to the right
-2x+2^x=21
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