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f(x-3)=4(x-3)+3=4x-12+3=4x-9
f(x)-f(x-3)=(4x+3)-(4x-9)=12
2. f(x)=x+1
f(-(x+2))=-(x+2)+1=-x-2+1=-x-1
f(-x-2)=-x-2+1=-x-1
jd,f(-(x+2))=f(-x-2)