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4+u=-10-10-2u
We move all terms to the left:
4+u-(-10-10-2u)=0
We add all the numbers together, and all the variables
u-(-2u-20)+4=0
We get rid of parentheses
u+2u+20+4=0
We add all the numbers together, and all the variables
3u+24=0
We move all terms containing u to the left, all other terms to the right
3u=-24
u=-24/3
u=-8
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