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850-270k=390k-1889
We simplify the equation to the form, which is simple to understand
850-270k=390k-1889
We move all terms containing k to the left and all other terms to the right.
-270k-390k=-1889-850
We simplify left and right side of the equation.
-660k=-2739
We divide both sides of the equation by -660 to get k.
k=4.15
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