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