f(x) = -3x
f(x-1) = -3(x-1) = -3x+3
f(5-2x) = -3(5-2x) = -15+6x
f(x-1) = f(5-2x)
-3x+3 = -15+6x
-3x-6x = -15-3
-9x = -18
x = -18:(-9)
x= 2
Ответ: 2
f(x) = -3x
f(x-1) = -3(x-1) = -3x+3
f(5-2x) = -3(5-2x) = -15+6x
f(x-1) = f(5-2x)
-3x+3 = -15+6x
-3x-6x = -15-3
-9x = -18
x = -18:(-9)
x= 2
Ответ: 2