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-6(k+85)=30
We move all terms to the left:
-6(k+85)-(30)=0
We multiply parentheses
-6k-510-30=0
We add all the numbers together, and all the variables
-6k-540=0
We move all terms containing k to the left, all other terms to the right
-6k=540
k=540/-6
k=-90
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