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2u-40=-4(u-5)
We move all terms to the left:
2u-40-(-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)
2u+4u-20-40=0
We add all the numbers together, and all the variables
6u-60=0
We move all terms containing u to the left, all other terms to the right
6u=60
u=60/6
u=10
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