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f(x-2) = 3x-4
⇔ f(1-2) = 3x-4
f(-1) = 3.(-1)-4
= -7
⇔ f(2-2) = 3x-4
f(0) = 3.0-4
= -4
⇔ f(3-2) = 3x-4
f(1) = 3.1-4
= -1
f(x+3) = 3x-4
⇔ f(1+3) = 3x-4
f(4) = 3.4-4
= 8
⇔ f(2+3) = 3x-4
f(5) = 3.5-4
= 11
⇔ f(3+3) = 3x-4
f(6) = 3.6-4
= 14