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4-8u=-1-9u
We move all terms to the left:
4-8u-(-1-9u)=0
We add all the numbers together, and all the variables
-8u-(-9u-1)+4=0
We get rid of parentheses
-8u+9u+1+4=0
We add all the numbers together, and all the variables
u+5=0
We move all terms containing u to the left, all other terms to the right
u=-5
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