f(x) = 7x
f(4 - x) = 7(4 - x) = 28 - 7x
f(x + 4) = 7(x + 4) = 7x + 28
f(4 - x) + f(x + 4) = 28 - 7x + 7x + 28 = 56
ответ : 56
f(x) = 7x
f(4 - x) = 7(4 - x) = 28 - 7x
f(x + 4) = 7(x + 4) = 7x + 28
f(4 - x) + f(x + 4) = 28 - 7x + 7x + 28 = 56
ответ : 56