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-5-10=-7(u+4)
We move all terms to the left:
-5-10-(-7(u+4))=0
We add all the numbers together, and all the variables
-(-7(u+4))-15=0
We calculate terms in parentheses: -(-7(u+4)), so:We get rid of parentheses
-7(u+4)
We multiply parentheses
-7u-28
Back to the equation:
-(-7u-28)
7u+28-15=0
We add all the numbers together, and all the variables
7u+13=0
We move all terms containing u to the left, all other terms to the right
7u=-13
u=-13/7
u=-1+6/7
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