Brute force solution to a quiz-formula given by symbols

output.js

{ a: 7, b: 2, c: 5, d: 4, e: 1, f: 3, g: 8, h: 6 }

symbol-formula.js

let digits = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];

function checkEquations (a, b, c, d, e, f, g, h) {
    let a1 = a * 100  + a * 10 + b;
    let a2 = b * 10 + c;
    let a3 = a * 100 + d * 10 + a;

    let b1 = b * 10 + d;
    let b2 = e * 10 + f;
    let b3 = e * 10 + e;

    let c1 = a * 100 + d * 10 + g;
    let c2 = e * 10 + b;
    let c3 = a * 100 + f * 10 + h;

    let eq1 = a1 - a2 == a3;
    let eq2 = b1 - b2 == b3;
    let eq3 = c1 - c2 == c3;
    let eq4 = a1 - b1 == c1;
    let eq5 = a2 - b2 == c2;
    let eq6 = a3 - b3 == c3;

    return eq1 && eq2 && eq3 && eq4 && eq5 && eq6;
}

digits.forEach((a) =>
    digits.forEach((b) =>
        digits.forEach((c) =>
            digits.forEach((d) =>
                digits.forEach((e) =>
                    digits.forEach((f) =>
                        digits.forEach((g) =>
                            digits.forEach((h) => {
                                let result = checkEquations(a, b, c, d, e, f, g, h);
                                if (result) {
                                    console.log({a: a, b: b, c: c, d: d, e: e, f: f, g: g, h: h});
                                }
                            })
                        )
                    )
                )
            )
        )
    )
);