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71=7^x-3
We move all terms to the left:
71-(7^x-3)=0
We get rid of parentheses
-7^x+3+71=0
We add all the numbers together, and all the variables
-7^x+74=0
We move all terms containing x to the left, all other terms to the right
-7^x=-74
x=-74/1
x=-74
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