Interesting...plz help

Let the range of the function f: R→ R
f(x) = | x-1| + |x - a| + | x| + |x+1| + |x+ 2a - 21 |
a being a real parameter given by [α,∞).Then find the no. of integral values of a for which there is exactly one x0ε R such that f(x0) = α

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