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75=u-(-15)
We move all terms to the left:
75-(u-(-15))=0
We calculate terms in parentheses: -(u-(-15)), so:We get rid of parentheses
u-(-15)
We add all the numbers together, and all the variables
u+15
Back to the equation:
-(u+15)
-u-15+75=0
We add all the numbers together, and all the variables
-1u+60=0
We move all terms containing u to the left, all other terms to the right
-u=-60
u=-60/-1
u=+60
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