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2.5=u-7.5
We move all terms to the left:
2.5-(u-7.5)=0
We get rid of parentheses
-u+7.5+2.5=0
We add all the numbers together, and all the variables
-1u+10=0
We move all terms containing u to the left, all other terms to the right
-u=-10
u=-10/-1
u=+10
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