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15=-1+4k
We move all terms to the left:
15-(-1+4k)=0
We add all the numbers together, and all the variables
-(4k-1)+15=0
We get rid of parentheses
-4k+1+15=0
We add all the numbers together, and all the variables
-4k+16=0
We move all terms containing k to the left, all other terms to the right
-4k=-16
k=-16/-4
k=+4
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