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17.9u=-6.84+14.1u
We move all terms to the left:
17.9u-(-6.84+14.1u)=0
We add all the numbers together, and all the variables
17.9u-(14.1u-6.84)=0
We get rid of parentheses
17.9u-14.1u+6.84=0
We add all the numbers together, and all the variables
3.8u+6.84=0
We move all terms containing u to the left, all other terms to the right
3.8u=-6.84
u=-6.84/3.8
u=-1+1/1.25
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