f(x) = - 2x + 3
f(- 1) = - 2 . (- 1) + 3 = 2 + 3 = 5
f(1/2) = - 2 . 1/2 + 3 = - 1 + 3 = 2
f(- 1) + f(1/2) = 5 + 2 = 7
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f(x) = - 2x + 3
f(- 1) = - 2 . (- 1) + 3 = 2 + 3 = 5
f(1/2) = - 2 . 1/2 + 3 = - 1 + 3 = 2
f(- 1) + f(1/2) = 5 + 2 = 7