Question

-9*(а-4)+7*(5а+6)
-5*(с+7)+4*(с-3)
-12*(-1/3а+5/6б-1/4с)+(-4а-2б)

Answer 1

$- 9(a - 4) + 7(5a + 6) = - 9a + 36 + 35a + 42 = 26a + 78$

$- 5(c + 7) + 4(c - 3) = - 5c - 35 + 4c - 12 = - c - 47$

$- 12( - \frac{1}{3} a + \frac{5}{6} b - \frac{1}{4} c) + ( - 4a - 2b) = \frac{12}{3} a - \frac{12 \times 5}{6} b - \frac{12}{4} c - 4 a - 2b = 4a - 10b - 3c - 4a - 2b = - 12b - 3c$