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If f(x) {{:(,a+bx, x lt 1),(,4,x=1),(,b-...

If `f(x) {{:(,a+bx, x lt 1),(,4,x=1),(,b-ax,x gt 1):} and" if " underset(x to 1)lim f(x)=f(1)`, what are the possible value of 'a and b'?

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