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f(17) - f(7) ?
f(17) = 4x-7
f(17) = 4(17) - 7
f(17) = 68 - 7
f(17) = 61
f(7) = 4x-7
f(7) = 28 - 7
f(7) = 21
f(17) - f(7) = 61 - 21 = 40
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