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Suppose f(x)={{:(a+bx,if x lt 1),(4, if ...

Suppose `f(x)={{:(a+bx,if x lt 1),(4, if x =1),(b-ax, ifx gt 1):}`
If `Lt_(x to 1-)f(x)=f(1), Lt_(x to 1+)f(x)=f(1)` then find the possible values of a and b.

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