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87=5k+17
We move all terms to the left:
87-(5k+17)=0
We get rid of parentheses
-5k-17+87=0
We add all the numbers together, and all the variables
-5k+70=0
We move all terms containing k to the left, all other terms to the right
-5k=-70
k=-70/-5
k=+14
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