What is the this expression in standard form?: 6 (5r-4) - 2 (r-7s-3)

Use distrubutive property a (b + c) = ab + ac

6 (5r - 4) - 2 (r - 7s - 3)

= (6) (5r) + (6) (-4) + (-2) (r) + (-2) (-7s) + (-2) (-3)

= 30r - 24 - 2r + 14s + 6

= (30r - 2r) + 14s + (-24 + 6)

= 28r + 14s - 18