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-6(k+72)=-90
We move all terms to the left:
-6(k+72)-(-90)=0
We add all the numbers together, and all the variables
-6(k+72)+90=0
We multiply parentheses
-6k-432+90=0
We add all the numbers together, and all the variables
-6k-342=0
We move all terms containing k to the left, all other terms to the right
-6k=342
k=342/-6
k=-57
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