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54=36-9u
We move all terms to the left:
54-(36-9u)=0
We add all the numbers together, and all the variables
-(-9u+36)+54=0
We get rid of parentheses
9u-36+54=0
We add all the numbers together, and all the variables
9u+18=0
We move all terms containing u to the left, all other terms to the right
9u=-18
u=-18/9
u=-2
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