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8+36u^-2=54u^-1
We move all terms to the left:
8+36u^-2-(54u^-1)=0
We add all the numbers together, and all the variables
36u-(54u^-1)+6=0
We get rid of parentheses
36u-54u^+1+6=0
We add all the numbers together, and all the variables
-18u+7=0
We move all terms containing u to the left, all other terms to the right
-18u=-7
u=-7/-18
u=7/18
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