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87=-2(4+8k)-1
We move all terms to the left:
87-(-2(4+8k)-1)=0
We add all the numbers together, and all the variables
-(-2(8k+4)-1)+87=0
We calculate terms in parentheses: -(-2(8k+4)-1), so:We get rid of parentheses
-2(8k+4)-1
We multiply parentheses
-16k-8-1
We add all the numbers together, and all the variables
-16k-9
Back to the equation:
-(-16k-9)
16k+9+87=0
We add all the numbers together, and all the variables
16k+96=0
We move all terms containing k to the left, all other terms to the right
16k=-96
k=-96/16
k=-6
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