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103=-u+190
We move all terms to the left:
103-(-u+190)=0
We add all the numbers together, and all the variables
-(-1u+190)+103=0
We get rid of parentheses
1u-190+103=0
We add all the numbers together, and all the variables
u-87=0
We move all terms containing u to the left, all other terms to the right
u=87
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