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-3=-6u+3(u+3)
We move all terms to the left:
-3-(-6u+3(u+3))=0
We calculate terms in parentheses: -(-6u+3(u+3)), so:We get rid of parentheses
-6u+3(u+3)
We multiply parentheses
-6u+3u+9
We add all the numbers together, and all the variables
-3u+9
Back to the equation:
-(-3u+9)
3u-9-3=0
We add all the numbers together, and all the variables
3u-12=0
We move all terms containing u to the left, all other terms to the right
3u=12
u=12/3
u=4
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