IS曲线推导

def solve(____):
    a, b = consumption_func
    c, d = investment_func
    is_curve = []
    for r in interest_rates:
        investment = c - d * r
        y = (____) / (____ - b)
        is_curve.append({"____": r, "____": round(____)})
    return {"____": is_curve}