\left\{ \begin{array} { l } { 39000 = 300 k } \end{array} \right.
Solve for k
k=130
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\frac{39000}{300}=k
Divide both sides by 300.
130=k
Divide 39000 by 300 to get 130.
k=130
Swap sides so that all variable terms are on the left hand side.
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