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-3u+11=-u+51
We move all terms to the left:
-3u+11-(-u+51)=0
We add all the numbers together, and all the variables
-3u-(-1u+51)+11=0
We get rid of parentheses
-3u+1u-51+11=0
We add all the numbers together, and all the variables
-2u-40=0
We move all terms containing u to the left, all other terms to the right
-2u=40
u=40/-2
u=-20
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