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1.8+0.2u=-0.1u
We move all terms to the left:
1.8+0.2u-(-0.1u)=0
We get rid of parentheses
0.2u+0.1u+1.8=0
We add all the numbers together, and all the variables
0.3u+1.8=0
We move all terms containing u to the left, all other terms to the right
0.3u=-1.8
u=-1.8/0.3
u=-6+2.2204460492503E-16/0.3
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