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u/10+9=12
We move all terms to the left:
u/10+9-(12)=0
We add all the numbers together, and all the variables
u/10-3=0
We multiply all the terms by the denominator
u-3*10=0
We add all the numbers together, and all the variables
u-30=0
We move all terms containing u to the left, all other terms to the right
u=30
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