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6+12u=-15+14u
We move all terms to the left:
6+12u-(-15+14u)=0
We add all the numbers together, and all the variables
12u-(14u-15)+6=0
We get rid of parentheses
12u-14u+15+6=0
We add all the numbers together, and all the variables
-2u+21=0
We move all terms containing u to the left, all other terms to the right
-2u=-21
u=-21/-2
u=10+1/2
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