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8x=(x+504)
We move all terms to the left:
8x-((x+504))=0
We calculate terms in parentheses: -((x+504)), so:We get rid of parentheses
(x+504)
We get rid of parentheses
x+504
Back to the equation:
-(x+504)
8x-x-504=0
We add all the numbers together, and all the variables
7x-504=0
We move all terms containing x to the left, all other terms to the right
7x=504
x=504/7
x=72
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