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87=8(3+k)+7
We move all terms to the left:
87-(8(3+k)+7)=0
We add all the numbers together, and all the variables
-(8(k+3)+7)+87=0
We calculate terms in parentheses: -(8(k+3)+7), so:We get rid of parentheses
8(k+3)+7
We multiply parentheses
8k+24+7
We add all the numbers together, and all the variables
8k+31
Back to the equation:
-(8k+31)
-8k-31+87=0
We add all the numbers together, and all the variables
-8k+56=0
We move all terms containing k to the left, all other terms to the right
-8k=-56
k=-56/-8
k=+7
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