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8=12u-28
We move all terms to the left:
8-(12u-28)=0
We get rid of parentheses
-12u+28+8=0
We add all the numbers together, and all the variables
-12u+36=0
We move all terms containing u to the left, all other terms to the right
-12u=-36
u=-36/-12
u=+3
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