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-0.8=-0.6u+0.5u
We move all terms to the left:
-0.8-(-0.6u+0.5u)=0
We add all the numbers together, and all the variables
-(-0.1u)-0.8=0
We get rid of parentheses
0.1u-0.8=0
We move all terms containing u to the left, all other terms to the right
0.1u=0.8
u=0.8/0.1
u=8
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