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-3u+10=-u
We move all terms to the left:
-3u+10-(-u)=0
We add all the numbers together, and all the variables
-3u-(-1u)+10=0
We get rid of parentheses
-3u+1u+10=0
We add all the numbers together, and all the variables
-2u+10=0
We move all terms containing u to the left, all other terms to the right
-2u=-10
u=-10/-2
u=+5
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