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90=9(k-88)
We move all terms to the left:
90-(9(k-88))=0
We calculate terms in parentheses: -(9(k-88)), so:We get rid of parentheses
9(k-88)
We multiply parentheses
9k-792
Back to the equation:
-(9k-792)
-9k+792+90=0
We add all the numbers together, and all the variables
-9k+882=0
We move all terms containing k to the left, all other terms to the right
-9k=-882
k=-882/-9
k=+98
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