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-3(k-15)+3=-12
We move all terms to the left:
-3(k-15)+3-(-12)=0
We add all the numbers together, and all the variables
-3(k-15)+15=0
We multiply parentheses
-3k+45+15=0
We add all the numbers together, and all the variables
-3k+60=0
We move all terms containing k to the left, all other terms to the right
-3k=-60
k=-60/-3
k=+20
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