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f(x) = 2x - 1
f(17) = 2 x 17 - 1 = 34 - 1 = 33
f(7) = 2 x 7 - 1 = 14 - 1 = 13
jadi f(17) - f(7) = 33 - 13 = 20
f(x) = 4x - 2x - 7 + 3
f(x) = 2x - 4
untuk f(17) = 2.17 - 4 = 34 - 4 = 30
f(7) = 2.7 - 4 = 14 - 4 = 10
jadi nilai : f(17) - f(7) = 30 - 10 =20