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5u-17=7(u-3)
We move all terms to the left:
5u-17-(7(u-3))=0
We calculate terms in parentheses: -(7(u-3)), so:We get rid of parentheses
7(u-3)
We multiply parentheses
7u-21
Back to the equation:
-(7u-21)
5u-7u+21-17=0
We add all the numbers together, and all the variables
-2u+4=0
We move all terms containing u to the left, all other terms to the right
-2u=-4
u=-4/-2
u=+2
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