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u/9+43=51
We move all terms to the left:
u/9+43-(51)=0
We add all the numbers together, and all the variables
u/9-8=0
We multiply all the terms by the denominator
u-8*9=0
We add all the numbers together, and all the variables
u-72=0
We move all terms containing u to the left, all other terms to the right
u=72
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