(35n 3 - 30n 2 + 25n) ÷ (-5n)
(35n 3-30n 2+25n)÷(-5n):35n×3-30n×2+25n÷(-5n)(35n×3)-(30n×2)+25n÷(-5n) 105n-60n+{25n÷(-5n)}105n-60n+(-5n)45n+(-5n)40n