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99=-9(5+k)
We move all terms to the left:
99-(-9(5+k))=0
We add all the numbers together, and all the variables
-(-9(k+5))+99=0
We calculate terms in parentheses: -(-9(k+5)), so:We get rid of parentheses
-9(k+5)
We multiply parentheses
-9k-45
Back to the equation:
-(-9k-45)
9k+45+99=0
We add all the numbers together, and all the variables
9k+144=0
We move all terms containing k to the left, all other terms to the right
9k=-144
k=-144/9
k=-16
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