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7=-u+206
We move all terms to the left:
7-(-u+206)=0
We add all the numbers together, and all the variables
-(-1u+206)+7=0
We get rid of parentheses
1u-206+7=0
We add all the numbers together, and all the variables
u-199=0
We move all terms containing u to the left, all other terms to the right
u=199
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