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4u=5u+15
We move all terms to the left:
4u-(5u+15)=0
We get rid of parentheses
4u-5u-15=0
We add all the numbers together, and all the variables
-1u-15=0
We move all terms containing u to the left, all other terms to the right
-u=15
u=15/-1
u=-15
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