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-10.3+5u=2.2
We move all terms to the left:
-10.3+5u-(2.2)=0
We add all the numbers together, and all the variables
5u-12.5=0
We move all terms containing u to the left, all other terms to the right
5u=12.5
u=12.5/5
u=2+2.5/5
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