If z = f(x, y), where f is differentiable, and x = g(t) y = h(t) h(1) = 5 h'(1) = -7 g(1) = 4 g'(1) = 1 fx(4, 5) = -5 fy(4, 5) = 6 find dz/dt when t = 1. dz dt =

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