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5.52+5.6u=5.8u+6.42
We move all terms to the left:
5.52+5.6u-(5.8u+6.42)=0
We get rid of parentheses
5.6u-5.8u-6.42+5.52=0
We add all the numbers together, and all the variables
-0.2u-0.9=0
We move all terms containing u to the left, all other terms to the right
-0.2u=0.9
u=0.9/-0.2
u=-4+0.1/0.2
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