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f(x)=4(2x-3) - 7
f(x)= 8x-12-7
f(x)= 8x - 19
f(17) = 8(17) - 19
f(17) = 117
f(7)= 8(7) - 19
f(7)= 37
maka f(17) - f(7) = 117 - 37 = 80
:)