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Algebra 1Superchallenge

Algebra 1 · Superchallenge problem

A linear function ff satisfies f(1)+f(2)+⋯+f(10)=175f(1) + f(2) + \cdots + f(10) = 175 and f(11)+f(12)+⋯+f(20)=475f(11) + f(12) + \cdots + f(20) = 475. Find f(0)f(0).

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