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6u=18.87+7.7u
We move all terms to the left:
6u-(18.87+7.7u)=0
We add all the numbers together, and all the variables
6u-(7.7u+18.87)=0
We get rid of parentheses
6u-7.7u-18.87=0
We add all the numbers together, and all the variables
-1.7u-18.87=0
We move all terms containing u to the left, all other terms to the right
-1.7u=18.87
u=18.87/-1.7
u=-11+0.17/1.7
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