Solve for k
k=-\frac{1}{13}\approx -0.076923077
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-3=36k+3k
Subtract 7 from 4 to get -3.
-3=39k
Combine 36k and 3k to get 39k.
39k=-3
Swap sides so that all variable terms are on the left hand side.
k=\frac{-3}{39}
Divide both sides by 39.
k=-\frac{1}{13}
Reduce the fraction \frac{-3}{39} to lowest terms by extracting and canceling out 3.
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