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1+5u=-9+4u
We move all terms to the left:
1+5u-(-9+4u)=0
We add all the numbers together, and all the variables
5u-(4u-9)+1=0
We get rid of parentheses
5u-4u+9+1=0
We add all the numbers together, and all the variables
u+10=0
We move all terms containing u to the left, all other terms to the right
u=-10
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