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-25=5u+5
We move all terms to the left:
-25-(5u+5)=0
We get rid of parentheses
-5u-5-25=0
We add all the numbers together, and all the variables
-5u-30=0
We move all terms containing u to the left, all other terms to the right
-5u=30
u=30/-5
u=-6
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