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2u=5u-87
We move all terms to the left:
2u-(5u-87)=0
We get rid of parentheses
2u-5u+87=0
We add all the numbers together, and all the variables
-3u+87=0
We move all terms containing u to the left, all other terms to the right
-3u=-87
u=-87/-3
u=+29
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