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= 2(x-1) + 4
= 2x-2 + 4
= 2x+2
(g ₀ f)(x) = 2x+2
y = 2x+2
2x = y-2
x = (y-2) : 2
(g ₀ f)(x) = (x-2) : 2
(g ₀ f)-1 (10) = (10-2):2
= 8:2
= 4