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(u-3)-5u=-3(u+3)
We move all terms to the left:
(u-3)-5u-(-3(u+3))=0
We add all the numbers together, and all the variables
-5u+(u-3)-(-3(u+3))=0
We get rid of parentheses
-5u+u-(-3(u+3))-3=0
We calculate terms in parentheses: -(-3(u+3)), so:We add all the numbers together, and all the variables
-3(u+3)
We multiply parentheses
-3u-9
Back to the equation:
-(-3u-9)
-4u-(-3u-9)-3=0
We get rid of parentheses
-4u+3u+9-3=0
We add all the numbers together, and all the variables
-1u+6=0
We move all terms containing u to the left, all other terms to the right
-u=-6
u=-6/-1
u=+6
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