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-10=10(k-9)*
We move all terms to the left:
-10-(10(k-9)*)=0
We calculate terms in parentheses: -(10(k-9)*), so:We get rid of parentheses
10(k-9)*
We multiply parentheses
10k-90
Back to the equation:
-(10k-90)
-10k+90-10=0
We add all the numbers together, and all the variables
-10k+80=0
We move all terms containing k to the left, all other terms to the right
-10k=-80
k=-80/-10
k=+8
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