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51=8x+9
We move all terms to the left:
51-(8x+9)=0
We get rid of parentheses
-8x-9+51=0
We add all the numbers together, and all the variables
-8x+42=0
We move all terms containing x to the left, all other terms to the right
-8x=-42
x=-42/-8
x=5+1/4
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