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26=u/4-9
We move all terms to the left:
26-(u/4-9)=0
We get rid of parentheses
-u/4+9+26=0
We multiply all the terms by the denominator
-u+9*4+26*4=0
We add all the numbers together, and all the variables
-1u+140=0
We move all terms containing u to the left, all other terms to the right
-u=-140
u=-140/-1
u=+140
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