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-4u+17=9(u-1)
We move all terms to the left:
-4u+17-(9(u-1))=0
We calculate terms in parentheses: -(9(u-1)), so:We get rid of parentheses
9(u-1)
We multiply parentheses
9u-9
Back to the equation:
-(9u-9)
-4u-9u+9+17=0
We add all the numbers together, and all the variables
-13u+26=0
We move all terms containing u to the left, all other terms to the right
-13u=-26
u=-26/-13
u=+2
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