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-4u+2+5u=10+9u
We move all terms to the left:
-4u+2+5u-(10+9u)=0
We add all the numbers together, and all the variables
-4u+5u-(9u+10)+2=0
We add all the numbers together, and all the variables
u-(9u+10)+2=0
We get rid of parentheses
u-9u-10+2=0
We add all the numbers together, and all the variables
-8u-8=0
We move all terms containing u to the left, all other terms to the right
-8u=8
u=8/-8
u=-1
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