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-28=5u+7
We move all terms to the left:
-28-(5u+7)=0
We get rid of parentheses
-5u-7-28=0
We add all the numbers together, and all the variables
-5u-35=0
We move all terms containing u to the left, all other terms to the right
-5u=35
u=35/-5
u=-7
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