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8+u+3u=-2u-10
We move all terms to the left:
8+u+3u-(-2u-10)=0
We add all the numbers together, and all the variables
4u-(-2u-10)+8=0
We get rid of parentheses
4u+2u+10+8=0
We add all the numbers together, and all the variables
6u+18=0
We move all terms containing u to the left, all other terms to the right
6u=-18
u=-18/6
u=-3
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