№ 1
а) 3(4 - х) = 12 - 3х
б) 8(-6 - m) = - 48 - 8m
в) - 3(-7 - t) = 21 + 3t
№ 2
а) - 8(t - 2) + 4 = - 8t + 16 + 4 = -8t + 20 = 20 - 8t
,) - 15 - 2(-4 - x) = - 15 +8 + 2x = -7 + 2х = 2х - 7
в) -2(х + 4) + 10(t -2) = -2х - 8 + 10t - 20 = -2х - 28 + 10t
г) 4(6 - а) - 7(b + 9) = 24 - 4a - 7b - 63 = -39 - 4a - 7b