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-4u/9=28
We move all terms to the left:
-4u/9-(28)=0
We multiply all the terms by the denominator
-4u-28*9=0
We add all the numbers together, and all the variables
-4u-252=0
We move all terms containing u to the left, all other terms to the right
-4u=252
u=252/-4
u=-63
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