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219=107-u
We move all terms to the left:
219-(107-u)=0
We add all the numbers together, and all the variables
-(-1u+107)+219=0
We get rid of parentheses
1u-107+219=0
We add all the numbers together, and all the variables
u+112=0
We move all terms containing u to the left, all other terms to the right
u=-112
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