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4=u6.4
We move all terms to the left:
4-(u6.4)=0
We add all the numbers together, and all the variables
-(+u6.4)+4=0
We get rid of parentheses
-u6.4+4=0
We move all terms containing u to the left, all other terms to the right
-u6.4=-4
u=-4/1
u=-4
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