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15=25((2)^-5k)
We move all terms to the left:
15-(25((2)^-5k))=0
We calculate terms in parentheses: -(25(2^-5k)), so:We get rid of parentheses
25(2^-5k)
We multiply parentheses
-125k+
We add all the numbers together, and all the variables
-125k
Back to the equation:
-(-125k)
125k+15=0
We move all terms containing k to the left, all other terms to the right
125k=-15
k=-15/125
k=-3/25
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