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4u-51=5u-65
We move all terms to the left:
4u-51-(5u-65)=0
We get rid of parentheses
4u-5u+65-51=0
We add all the numbers together, and all the variables
-1u+14=0
We move all terms containing u to the left, all other terms to the right
-u=-14
u=-14/-1
u=+14
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