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12=5u-3
We move all terms to the left:
12-(5u-3)=0
We get rid of parentheses
-5u+3+12=0
We add all the numbers together, and all the variables
-5u+15=0
We move all terms containing u to the left, all other terms to the right
-5u=-15
u=-15/-5
u=+3
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