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-6.1=u/5+6.4
We move all terms to the left:
-6.1-(u/5+6.4)=0
We get rid of parentheses
-u/5-6.4-6.1=0
We multiply all the terms by the denominator
-u-(6.4)*5-(6.1)*5=0
We add all the numbers together, and all the variables
-1u-62.5=0
We move all terms containing u to the left, all other terms to the right
-u=62.5
u=62.5/-1
u=-62+0.5/1
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