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5.7-(4.6)=u
We move all terms to the left:
5.7-(4.6)-(u)=0
We add all the numbers together, and all the variables
-1u+1.1=0
We move all terms containing u to the left, all other terms to the right
-u=-1.1
u=-1.1/-1
u=1+0.1/1
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