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u/4=-9
We move all terms to the left:
u/4-(-9)=0
We add all the numbers together, and all the variables
u/4+9=0
We multiply all the terms by the denominator
u+9*4=0
We add all the numbers together, and all the variables
u+36=0
We move all terms containing u to the left, all other terms to the right
u=-36
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