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2(u+1)=4u+6
We move all terms to the left:
2(u+1)-(4u+6)=0
We multiply parentheses
2u-(4u+6)+2=0
We get rid of parentheses
2u-4u-6+2=0
We add all the numbers together, and all the variables
-2u-4=0
We move all terms containing u to the left, all other terms to the right
-2u=4
u=4/-2
u=-2
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