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-6u+3(u-5)=-12
We move all terms to the left:
-6u+3(u-5)-(-12)=0
We add all the numbers together, and all the variables
-6u+3(u-5)+12=0
We multiply parentheses
-6u+3u-15+12=0
We add all the numbers together, and all the variables
-3u-3=0
We move all terms containing u to the left, all other terms to the right
-3u=3
u=3/-3
u=-1
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