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512=7^3x+5
We move all terms to the left:
512-(7^3x+5)=0
We get rid of parentheses
-7^3x-5+512=0
We add all the numbers together, and all the variables
-7^3x+507=0
We move all terms containing x to the left, all other terms to the right
-7^3x=-507
x=-507/1
x=-507
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