let line = number-line(
    start: -10,
    end: 10,
    tick-step: 1,
    numbering-step: 2,
    arrows: true,
    points: (
        (name: "P", pos: -6, fill: blue),
        (name: "Q", pos: 2, fill: red),
        (name: "R", pos: 6, fill: blue),
    )
)

show: number_line

