-3(5-7x) + 4(x-7)= -3 5 + 3 7x + 4 x - 4 7= -15 + 21x + 4x - 28= 21x + 4x - 15 - 28= 25x - 43
Ответ: 25x - 43
-3(5-7x) + 4(x-7)
= -3 5 + 3 7x + 4 x - 4 7
= -15 + 21x + 4x - 28
= 21x + 4x - 15 - 28
= 25x - 43
Ответ: 25x - 43