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28/13=u
We move all terms to the left:
28/13-(u)=0
We add all the numbers together, and all the variables
-1u+28/13=0
We multiply all the terms by the denominator
-1u*13+28=0
Wy multiply elements
-13u+28=0
We move all terms containing u to the left, all other terms to the right
-13u=-28
u=-28/-13
u=2+2/13
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