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(fog)(x) = 2x^2 + x-3
g(x) = ?
f(g(x)) = 2x^2 + x-3
2 g(x) -1 = 2x^2 + x-3
2 g(x) = 2x^2 + x-3+1
2 g(x) =2x^2 + x-2
g(x) = x^2 + 1/2x - 1