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22=-7u+4u+28
We move all terms to the left:
22-(-7u+4u+28)=0
We add all the numbers together, and all the variables
-(-3u+28)+22=0
We get rid of parentheses
3u-28+22=0
We add all the numbers together, and all the variables
3u-6=0
We move all terms containing u to the left, all other terms to the right
3u=6
u=6/3
u=2
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