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15=2u-5
We move all terms to the left:
15-(2u-5)=0
We get rid of parentheses
-2u+5+15=0
We add all the numbers together, and all the variables
-2u+20=0
We move all terms containing u to the left, all other terms to the right
-2u=-20
u=-20/-2
u=+10
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