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4u/9=-20
We move all terms to the left:
4u/9-(-20)=0
We add all the numbers together, and all the variables
4u/9+20=0
We multiply all the terms by the denominator
4u+20*9=0
We add all the numbers together, and all the variables
4u+180=0
We move all terms containing u to the left, all other terms to the right
4u=-180
u=-180/4
u=-45
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