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-u/2+7=-6
We move all terms to the left:
-u/2+7-(-6)=0
We add all the numbers together, and all the variables
-u/2+13=0
We multiply all the terms by the denominator
-u+13*2=0
We add all the numbers together, and all the variables
-1u+26=0
We move all terms containing u to the left, all other terms to the right
-u=-26
u=-26/-1
u=+26
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