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-8u+2(u-3)=-12
We move all terms to the left:
-8u+2(u-3)-(-12)=0
We add all the numbers together, and all the variables
-8u+2(u-3)+12=0
We multiply parentheses
-8u+2u-6+12=0
We add all the numbers together, and all the variables
-6u+6=0
We move all terms containing u to the left, all other terms to the right
-6u=-6
u=-6/-6
u=1
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