`\color{#a8b0b4}{⸻}\color{#91999d}{⸻}\color{#7a8286}{『}\color{#636b6f}{⛧} \color{#4c5356}{E}\color{#434a4d}{m}\color{#3b4244}{p}\color{#2a3133}{t}\color{#21282a}{y}\color{#1a2123}{B}\color{#141a1c}{o} \color{#0f1516}{y} \color{#05090a}{⛧}\color{#0a1011}{』}\color{#141a1c}{⸻}\color{#1a2123}{⸻}`

`b)`

`-x/4:5/8=5 1/7:9/14`

`-x/4:5/8=36/7:9/14`

`-x/4:5/8=18`

`-x/4=18*5/8=5`

`x=5*(-4)`

`x=-20`