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4(u+3)=7u-15
We move all terms to the left:
4(u+3)-(7u-15)=0
We multiply parentheses
4u-(7u-15)+12=0
We get rid of parentheses
4u-7u+15+12=0
We add all the numbers together, and all the variables
-3u+27=0
We move all terms containing u to the left, all other terms to the right
-3u=-27
u=-27/-3
u=+9
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