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4u+15=7u-9
We move all terms to the left:
4u+15-(7u-9)=0
We get rid of parentheses
4u-7u+9+15=0
We add all the numbers together, and all the variables
-3u+24=0
We move all terms containing u to the left, all other terms to the right
-3u=-24
u=-24/-3
u=+8
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