You multiply 7 by-12n = 84n. And the 7 by -3= -21. Then 10 by 6n = 60n and 10 by 7 which is 70. When you do all the it will give you -84n-21+60n+70. The. You combine like terms which is -84 and 60( because they both have n)= -24n and 70 with -21 which is 49. So overall the answer is -24n+49
