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205=2k-15
We move all terms to the left:
205-(2k-15)=0
We get rid of parentheses
-2k+15+205=0
We add all the numbers together, and all the variables
-2k+220=0
We move all terms containing k to the left, all other terms to the right
-2k=-220
k=-220/-2
k=+110
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