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u+12=31.u=20
We move all terms to the left:
u+12-(31.u)=0
We add all the numbers together, and all the variables
u-(+31.u)+12=0
We get rid of parentheses
u-31.u+12=0
We add all the numbers together, and all the variables
-30u+12=0
We move all terms containing u to the left, all other terms to the right
-30u=-12
u=-12/-30
u=2/5
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