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9u-10=4(u-5)
We move all terms to the left:
9u-10-(4(u-5))=0
We calculate terms in parentheses: -(4(u-5)), so:We get rid of parentheses
4(u-5)
We multiply parentheses
4u-20
Back to the equation:
-(4u-20)
9u-4u+20-10=0
We add all the numbers together, and all the variables
5u+10=0
We move all terms containing u to the left, all other terms to the right
5u=-10
u=-10/5
u=-2
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