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10+8u=-2u
We move all terms to the left:
10+8u-(-2u)=0
We get rid of parentheses
8u+2u+10=0
We add all the numbers together, and all the variables
10u+10=0
We move all terms containing u to the left, all other terms to the right
10u=-10
u=-10/10
u=-1
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