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f(x)= x+1
f{-(x+2)} = f(-x-2)
-(x+2) + 1= (-x-2) + 1
-x-2 + 1 = -x -2 +1
.
2)
f(x)= f(2x +1)
4x-5 = 4(2x+1) - 5
4x - 5 = 8x + 4 - 5
-4x = 4
x = -1