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2=5u+7
We move all terms to the left:
2-(5u+7)=0
We get rid of parentheses
-5u-7+2=0
We add all the numbers together, and all the variables
-5u-5=0
We move all terms containing u to the left, all other terms to the right
-5u=5
u=5/-5
u=-1
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