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87=-u+238
We move all terms to the left:
87-(-u+238)=0
We add all the numbers together, and all the variables
-(-1u+238)+87=0
We get rid of parentheses
1u-238+87=0
We add all the numbers together, and all the variables
u-151=0
We move all terms containing u to the left, all other terms to the right
u=151
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