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8x+521=5x+218
We move all terms to the left:
8x+521-(5x+218)=0
We get rid of parentheses
8x-5x-218+521=0
We add all the numbers together, and all the variables
3x+303=0
We move all terms containing x to the left, all other terms to the right
3x=-303
x=-303/3
x=-101
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