nomer 19+20 pake cara

maaf kalau salah.. semoga membantu
[tex]5 - \frac{2k}{4} = - 18 \\ - \frac{2k}{4} = - 18 - 5 \\ - \frac{2k}{4} = - 23 \\ - 2k = - 23 \times 4 \\ - 2k = - 92 \\ k = \frac{ - 92}{ - 2} \\ k = 46(a)[/tex]