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-15=-3+4k
We move all terms to the left:
-15-(-3+4k)=0
We add all the numbers together, and all the variables
-(4k-3)-15=0
We get rid of parentheses
-4k+3-15=0
We add all the numbers together, and all the variables
-4k-12=0
We move all terms containing k to the left, all other terms to the right
-4k=12
k=12/-4
k=-3
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