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51=43+u
We move all terms to the left:
51-(43+u)=0
We add all the numbers together, and all the variables
-(u+43)+51=0
We get rid of parentheses
-u-43+51=0
We add all the numbers together, and all the variables
-1u+8=0
We move all terms containing u to the left, all other terms to the right
-u=-8
u=-8/-1
u=+8
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