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9=u/4-16
We move all terms to the left:
9-(u/4-16)=0
We get rid of parentheses
-u/4+16+9=0
We multiply all the terms by the denominator
-u+16*4+9*4=0
We add all the numbers together, and all the variables
-1u+100=0
We move all terms containing u to the left, all other terms to the right
-u=-100
u=-100/-1
u=+100
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