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256=3+10k+3
We move all terms to the left:
256-(3+10k+3)=0
We add all the numbers together, and all the variables
-(10k+6)+256=0
We get rid of parentheses
-10k-6+256=0
We add all the numbers together, and all the variables
-10k+250=0
We move all terms containing k to the left, all other terms to the right
-10k=-250
k=-250/-10
k=+25
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